Methods of
Philosophical
Reasoning:
Fallacies
DANILO F. MARIBAO
FACULTY
Paliparan 3 Senior High School
Paliparan III, Dasmarinas City, Cavite
Caveat (an explanation or warning that
should be remembered when you are
doing or thinking about.
• Formal argument (e.g. syllogism)
–Inductive / deductive
• Fallacies
• Other philosophical methods
Example:
1. Monkey eat bananas, Pedro eat bananas too,
therefore Pedro is Monkey
2. Maria is intelligent, Lisa is a friend of Maria,
therefore Lisa is Intelligent.
ACTIVITY:
1. Form a group of five members.
2. Each group must formulate five
arguments.
3. Present to the class.
Analysis:
1.Looking at the arguments you focused on,
how would you assess the strength and
soundness of their arguments?
2. Are the arguments reasonable to you?
3. Do you agree with these arguments?
4. Do you think some arguments are
downright foolish or simply wrong?
5. What is your criterion for saying that this
arguments is a good one, and that
argument is bad?
GENERAL TYPES
• See list (word file: 28 fallacies with
suggested references)
1. FALLACIES OF RELEVANCE
2. FALLACIES OF WEAK INDUCTION
3. FALLACIES OF PRESUMPTION
4. FALLACIES OF AMBIGUITY
5. FALLACIES OF GRAMMATICAL ANALOGY
The 11 Fallacies of Relevance
Argumentum ad Baculum
• Appeal to Force/Stick
–committed when one appeals to
–force or the threat of force
–to bring about the acceptance of a
conclusion.
Example:
Chairman of the Board: “ All those opposed to
my arguments for the opening of a new
department, signify by saying ‘I resign.’”
Argumentum ad Misericordiam
• Appeal to Pity
–pity or a related emotion
–such as sympathy or compassion is
–appealed to for the sake of
–getting a conclusion accepted.
“Sir, hindi ako nakapag-aral, mahirap
lang po kami.”
Argumentum ad Populum
• Appeal to the People
–attempting to win popular assent
to a conclusion by
–arousing the feeling and
enthusiasms of the multitude
Appeal to the Majority
SNOB APPEAL
• Elite or
• Select Few
BANDWAGON
• Most people
• Almost all
people
Person L says statement p.
Person L is in the elite.
Statement p is true.
Most, many, or ALL persons
believe statement p is true.
Statement p is true.
The Danger of Crowds
Examples:
-Emperor’s New Clothes
(Hans Christian Anderson
Story)
-Prosecution of Jesus Christ
(Pontius Pilate)
JOY “Panghugas ng Buong Barangay”
DOWNY “Rubadabango
[Amoy ulam na ba kayo?]”
Appeal to Vanity
–Gaining support for an argument, not
by the strength of the argument, but
by
–using flattery on those whom you
want to accept your argument.
Argumentum ad Populum
Ang bait-bait mo talaga, pahingi naman
ng Nova.
You look so radiant today, can you help
me in my assignment?
You have a beach body, can you help me
load the bags inside the car.
Argumentum ad Hominem
• Argument against the Person
–attacking the character or
circumstances of an individual who is
– advancing a statement or an
argument instead of
–trying to disprove the soundness of
the argument
Tu Quoque
“You Too” Argument
– rather than trying to disprove a remark
about someone's character or
circumstances,
– one accuses the other of having the same
character or circumstances.
Argumentum ad Hominem
Genetic Fallacy
• The genetic fallacy is committed when an
idea is
• either accepted or rejected
• because of its source,
• rather than its merit.
DILAWAN!!!
Fallacy of Accident
• an attempt is made to apply a general rule
to all situations, when clearly there are
exceptions to the rule.
DOCTORS AND KNIVES
Ignoratio Elenchi
• Apparently refuting an opponent while
actually disproving something not
asserted
Red Herring
• An irrelevant topic is introduced in an
argument to divert the attention of
listeners from the original issue
Argumentum ad Crumenam
Appeal to Money
• supposing that a conclusion must be
valid because the person making the
argument is wealthy
FALLACIES OF WEAK
INDUCTION
Argumentum ad Verecundiam
Argumentum ad Ignorantiam
Fallacy of Hasty
Generalization
Fallacy of False Cause
Slippery Slope Fallacy
Fallacy of Weak Analogy
Argementum ad Verecundiam
(Appeal to Inappropriate People)
• Using authority as evidence but the
authority is not really an authority on facts
relevant to the argument
• Uses the admiration of the famous to try
and win support
Logical Form:
According to person A, X is true.
Therefore, X is true.
Example:
Oprah said that girls will go crazy for
boys if they are intelligent.
Example:
The president said that the economic
status of the Philippines is growing.
Argumentum ad Ignorantiam
(Appeal to Ignorance)
• Also known as “argument from ignorance” or
“argument from lack of imagination”.
• Saying something is true only because there is
no evidence to prove it wrong (or saying
something is false only because there is no
evidence to prove it is true)
• Argument ad Ignorantiam can be
expressed in multiple ways, including the
following:
One cannot prove that this is true,
therefore it is false.
No one observed this occur, therefore
it did not occur.
There is no proof to support Argument
X, therefore Argument Y is true.
Fallacy of Hasty Generalization
• Also known as the Fallacy of Insufficient
Statistics, Fallacy of Insufficient Sample,
Hasty Induction.
• This fallacy is committed when a person
draws a conclusion about a population
based on a sample that is not large
enough.
It has the following form:
1. Sample S is taken from population P.
2. Sample S is a very small part of
population P.
3. Conclusion C is drawn from sample S.
• The person committing the fallacy is
misusing the following type of reasoning,
which is known variously as Inductive
Generalization, Generalization, and
Statistical Generalization:
• Example #1:
My father smoked four packs of cigarettes a
day since age fourteen and lived until the age
of sixty-nine. Therefore, smoking really can’t
be that bad for you.
• Explanation: It is extremely unreasonable
(and dangerous) to draw a universal
conclusion about the health risks of smoking
by the case study of one man.
Fallacy of False Cause
• The fallacy committed when an
argument mistakenly attempt to
establish a causal connection.
• Post Hoc, Ergo Propter Hoc, Non Causa,
Pro Causa, Oversimplified Cause
Non Causa, Pro Causa
(Not the cause for a cause)
• In general, it is the fallacy of making a
mistake about the ascription of some
cause to an effect. This is the general
category of "false cause."
Post Hoc, Ergo Propter Hoc
(After this, therefore because of this)
• The fallacy of arguing that one event was
caused by another event merely because
it occurred after that event.
• If A happened then B happened, then A
must have caused B to happen.
• I wore my purple sweater and my team
won against all the odds. Therefore, I am
going to wear that sweater to every
game.
• Bill purchased a new PowerMac and it
worked fine for months. He then bought
and installed a new piece of software.
The next time he starts up his Mac, it
freezes. Bill concludes that the software
must be the cause of the freeze.
Oversimplified Cause
• Explaining an event by relying on
casual factors that are insufficient to
account for the event or by
overemphasizing the role of one or
more of these factors
Example:
Coach says that the reason his team
won their last game is because the
team had a high carbohydrate meal
before the game.
Slippery Slope Fallacy
• Also known as “Camel’s Nose”
• The arguer claims that a sort of chain reaction, usually ending in
some dire consequence, will take place, but there's really not
enough evidence for that assumption.
• A person asserts that some event must inevitably follow from
another without any argument for the inevitability of the event
in question.
Form:
1.Event X has occurred (or will or might occur).
2.Therefore event Y will inevitably happen.
Animal experimentation reduces our
respect for life. If we don't respect life,
we are likely to be more and more
tolerant of violent acts like war and
murder. Soon our society will become a
battlefield in which everyone constantly
fears for their lives. It will be the end of
civilization. To prevent this terrible
consequence, we should make animal
experimentation illegal right now.
Fallacy of Weak Analogy
• This type of argument, the issue at
hand is compared to another issue,
which is entirely different but in
some ways related, and uses the
other issue for its conclusion’s
acceptability or rejection.
Arguments by analogy rest on a
comparison.
Their logical structure is this:
(1)A and B are similar.
(2) A has a certain characteristic.
Therefore:
(3) B must have that characteristic too
• Thieves are criminals. Since cheating
is stealing, cheaters are criminals.
• Guns are like hammers - they’re both
tools with metal parts that could be
used to kill someone.

Topic 2. methods of philosophical reasoning

  • 1.
    Methods of Philosophical Reasoning: Fallacies DANILO F.MARIBAO FACULTY Paliparan 3 Senior High School Paliparan III, Dasmarinas City, Cavite
  • 2.
    Caveat (an explanationor warning that should be remembered when you are doing or thinking about. • Formal argument (e.g. syllogism) –Inductive / deductive • Fallacies • Other philosophical methods
  • 4.
    Example: 1. Monkey eatbananas, Pedro eat bananas too, therefore Pedro is Monkey 2. Maria is intelligent, Lisa is a friend of Maria, therefore Lisa is Intelligent.
  • 5.
    ACTIVITY: 1. Form agroup of five members. 2. Each group must formulate five arguments. 3. Present to the class.
  • 7.
    Analysis: 1.Looking at thearguments you focused on, how would you assess the strength and soundness of their arguments? 2. Are the arguments reasonable to you? 3. Do you agree with these arguments? 4. Do you think some arguments are downright foolish or simply wrong? 5. What is your criterion for saying that this arguments is a good one, and that argument is bad?
  • 8.
    GENERAL TYPES • Seelist (word file: 28 fallacies with suggested references) 1. FALLACIES OF RELEVANCE 2. FALLACIES OF WEAK INDUCTION 3. FALLACIES OF PRESUMPTION 4. FALLACIES OF AMBIGUITY 5. FALLACIES OF GRAMMATICAL ANALOGY
  • 9.
    The 11 Fallaciesof Relevance
  • 10.
    Argumentum ad Baculum •Appeal to Force/Stick –committed when one appeals to –force or the threat of force –to bring about the acceptance of a conclusion. Example: Chairman of the Board: “ All those opposed to my arguments for the opening of a new department, signify by saying ‘I resign.’”
  • 11.
    Argumentum ad Misericordiam •Appeal to Pity –pity or a related emotion –such as sympathy or compassion is –appealed to for the sake of –getting a conclusion accepted. “Sir, hindi ako nakapag-aral, mahirap lang po kami.”
  • 12.
    Argumentum ad Populum •Appeal to the People –attempting to win popular assent to a conclusion by –arousing the feeling and enthusiasms of the multitude
  • 13.
    Appeal to theMajority SNOB APPEAL • Elite or • Select Few BANDWAGON • Most people • Almost all people Person L says statement p. Person L is in the elite. Statement p is true. Most, many, or ALL persons believe statement p is true. Statement p is true.
  • 14.
  • 15.
    Examples: -Emperor’s New Clothes (HansChristian Anderson Story) -Prosecution of Jesus Christ (Pontius Pilate)
  • 16.
    JOY “Panghugas ngBuong Barangay”
  • 17.
  • 18.
    Appeal to Vanity –Gainingsupport for an argument, not by the strength of the argument, but by –using flattery on those whom you want to accept your argument. Argumentum ad Populum
  • 20.
    Ang bait-bait motalaga, pahingi naman ng Nova. You look so radiant today, can you help me in my assignment? You have a beach body, can you help me load the bags inside the car.
  • 21.
    Argumentum ad Hominem •Argument against the Person –attacking the character or circumstances of an individual who is – advancing a statement or an argument instead of –trying to disprove the soundness of the argument
  • 22.
    Tu Quoque “You Too”Argument – rather than trying to disprove a remark about someone's character or circumstances, – one accuses the other of having the same character or circumstances. Argumentum ad Hominem
  • 23.
    Genetic Fallacy • Thegenetic fallacy is committed when an idea is • either accepted or rejected • because of its source, • rather than its merit. DILAWAN!!!
  • 24.
    Fallacy of Accident •an attempt is made to apply a general rule to all situations, when clearly there are exceptions to the rule. DOCTORS AND KNIVES
  • 25.
    Ignoratio Elenchi • Apparentlyrefuting an opponent while actually disproving something not asserted
  • 26.
    Red Herring • Anirrelevant topic is introduced in an argument to divert the attention of listeners from the original issue
  • 27.
    Argumentum ad Crumenam Appealto Money • supposing that a conclusion must be valid because the person making the argument is wealthy
  • 28.
    FALLACIES OF WEAK INDUCTION Argumentumad Verecundiam Argumentum ad Ignorantiam Fallacy of Hasty Generalization Fallacy of False Cause Slippery Slope Fallacy Fallacy of Weak Analogy
  • 29.
    Argementum ad Verecundiam (Appealto Inappropriate People) • Using authority as evidence but the authority is not really an authority on facts relevant to the argument • Uses the admiration of the famous to try and win support Logical Form: According to person A, X is true. Therefore, X is true.
  • 30.
    Example: Oprah said thatgirls will go crazy for boys if they are intelligent.
  • 31.
    Example: The president saidthat the economic status of the Philippines is growing.
  • 32.
    Argumentum ad Ignorantiam (Appealto Ignorance) • Also known as “argument from ignorance” or “argument from lack of imagination”. • Saying something is true only because there is no evidence to prove it wrong (or saying something is false only because there is no evidence to prove it is true)
  • 33.
    • Argument adIgnorantiam can be expressed in multiple ways, including the following: One cannot prove that this is true, therefore it is false. No one observed this occur, therefore it did not occur. There is no proof to support Argument X, therefore Argument Y is true.
  • 34.
    Fallacy of HastyGeneralization • Also known as the Fallacy of Insufficient Statistics, Fallacy of Insufficient Sample, Hasty Induction. • This fallacy is committed when a person draws a conclusion about a population based on a sample that is not large enough.
  • 35.
    It has thefollowing form: 1. Sample S is taken from population P. 2. Sample S is a very small part of population P. 3. Conclusion C is drawn from sample S. • The person committing the fallacy is misusing the following type of reasoning, which is known variously as Inductive Generalization, Generalization, and Statistical Generalization:
  • 36.
    • Example #1: Myfather smoked four packs of cigarettes a day since age fourteen and lived until the age of sixty-nine. Therefore, smoking really can’t be that bad for you. • Explanation: It is extremely unreasonable (and dangerous) to draw a universal conclusion about the health risks of smoking by the case study of one man.
  • 37.
    Fallacy of FalseCause • The fallacy committed when an argument mistakenly attempt to establish a causal connection. • Post Hoc, Ergo Propter Hoc, Non Causa, Pro Causa, Oversimplified Cause
  • 38.
    Non Causa, ProCausa (Not the cause for a cause) • In general, it is the fallacy of making a mistake about the ascription of some cause to an effect. This is the general category of "false cause."
  • 39.
    Post Hoc, ErgoPropter Hoc (After this, therefore because of this) • The fallacy of arguing that one event was caused by another event merely because it occurred after that event. • If A happened then B happened, then A must have caused B to happen.
  • 40.
    • I woremy purple sweater and my team won against all the odds. Therefore, I am going to wear that sweater to every game. • Bill purchased a new PowerMac and it worked fine for months. He then bought and installed a new piece of software. The next time he starts up his Mac, it freezes. Bill concludes that the software must be the cause of the freeze.
  • 41.
    Oversimplified Cause • Explainingan event by relying on casual factors that are insufficient to account for the event or by overemphasizing the role of one or more of these factors
  • 42.
    Example: Coach says thatthe reason his team won their last game is because the team had a high carbohydrate meal before the game.
  • 43.
    Slippery Slope Fallacy •Also known as “Camel’s Nose” • The arguer claims that a sort of chain reaction, usually ending in some dire consequence, will take place, but there's really not enough evidence for that assumption. • A person asserts that some event must inevitably follow from another without any argument for the inevitability of the event in question. Form: 1.Event X has occurred (or will or might occur). 2.Therefore event Y will inevitably happen.
  • 44.
    Animal experimentation reducesour respect for life. If we don't respect life, we are likely to be more and more tolerant of violent acts like war and murder. Soon our society will become a battlefield in which everyone constantly fears for their lives. It will be the end of civilization. To prevent this terrible consequence, we should make animal experimentation illegal right now.
  • 45.
    Fallacy of WeakAnalogy • This type of argument, the issue at hand is compared to another issue, which is entirely different but in some ways related, and uses the other issue for its conclusion’s acceptability or rejection.
  • 46.
    Arguments by analogyrest on a comparison. Their logical structure is this: (1)A and B are similar. (2) A has a certain characteristic. Therefore: (3) B must have that characteristic too
  • 47.
    • Thieves arecriminals. Since cheating is stealing, cheaters are criminals. • Guns are like hammers - they’re both tools with metal parts that could be used to kill someone.