LOGICAL FALLACIES

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LOGICAL FALLACIES
 
What is a logical fallacy?
 
A fallacy is a deceptive, misleading, or false argument
There are many forms of logical fallacies
They all have one thing in common… bad logic
To spot a logical fallacy, ask yourself these questions:
Does the proof hold up?
Am I given the right number of choices?
Does the proof lead to the conclusion?
Logical fallacies are not forbidden in debate
However, if you are caught using them, there goes your
credibility
Fallacy #1: The False Comparison
 
https://www.youtube.com/watch?v=0ak7GZxpF2U
The fallacy uses bad proof
This fallacy lumps examples into the wrong
category
Some fruits are purple, this donut has purple, this donut
has fruit
Other examples: “Made with all natural
ingredients”
Break the argument down: Some natural things are
good for you, so all natural things must be good
But Ebola is natural
More False Comparison examples
 
https://www.youtube.com/watch?v=9NR-SqhJyeU
All ducks swim.  All fish swim.  All ducks are fish.
Child: “Dad, why don’t we have a PlayStation?
Everybody else has one.”
Reductio ad absurdem
 fallacy
“If everyone jumped off a cliff, would you do it, too?”
“I’m a successful business man.  Elect me mayor and
I’ll run a successful city”
How to Counter the Argument
All you need to do to counter this argument is find
one example to make it false, or show that the two
are not the same
“Purple is a fruit”
Give the example that an eggplant is not a fruit
“Everyone else has a PlayStation”
Name one person who doesn’t own a PlayStation
Eating lunch and wearing skirts
Completely different things
Fallacy #2: Bad Example, or Hasty
Generalization
 
https://www.youtube.com/watch?v=owGykVbfgUE
This fallacy uses a small sample size to apply to a
larger group
Synonyms: stereotyping, profiling
These could be tricky to spot because the person
making the argument might use facts or statistics to
support their argument
More Bad Example examples
 
https://www.youtube.com/watch?v=TBnB2AY2_vw
“LeBron James wears a certain kind of sneaker; buy
it and you’ll become a basketball star.”
Got Milk
 campaign
Arizona’s immigration law
Women are bad drivers
How to Counter this Argument
You need to show that the example used was a bad
example or led to a hasty generalization
You can give examples where the proof doesn’t hold up
(Say that you have LeBron’s shoes and have yet to slam
dunk a basketball)
Point out that your opponent's hasty generalization is
racist, sexist, etc. (
note: attack the argument, not your
opponent
)
Fallacy #3: Ignorance as Proof
 
https://www.youtube.com/watch?v=2Ra8_gyY9R8
Also known as 
Argumentum ad Ignorantiam
This is where you claim that something has not yet
been that it is not the case
Also, if something has not yet been 
disproven
 that it
is the case
No one has ever provided real evidence that ghosts do
not exist; therefore, ghosts exist
More Ignorance as Proof examples
 
Super 8 clip
Remember, things cannot be proven without
evidence
If someone tries to argue that something is true because
of a lack of evidence to the contrary they are using the
ignorance as proof
 fallacy
Fake scientist: “My theory has never been
disproven, so it must be true.”
How to Counter this Argument
 
Present your opponent with another argument that
has never been proven or disproven, and make sure
that it is absurd
Opponent: “I believe in extrasensory perception and
UFOs because scientists have never disproved them.”
You: “Scientists have never disproved that toys come to
life behind closed doors either.  Do you believe that?”
Fallacy #4: Tautology
 
The conclusion basically repeats the premise
“The Cowboys are favored to win since they’re the
better team”
Politician: “You can trust me because I’m an honest man”
Sportscaster: “The way for this team to make a
comeback is to score more points”
“You won’t have trouble selling this product because it
sells itself”
Anything that is redundant or can be responded with
“Duh” falls into this category
How to Counter this Argument
This fallacy is very easy to counter
All you have to do is point the redundancy in their
argument
You can also ask for evidence to better explain the
conclusion
“How are the Cowboys a better team?”
Fallacy #5: False Choice, or False
Dilemma
 
https://www.youtube.com/watch?v=GgLrMHm32j4
This is used when the number of choices you are
given is not the number of choices that actually exist
It could be used with a loaded question
Attorney: “When did you start beating your wife?”
False Dilemma
 is when you are made to decide
between only two choices
Parent: “You can either eat liver and onions for dinner,
or you can starve to death
More False Choice examples
 
https://www.youtube.com/watch?v=5tW-wqW18rY
“If you ain’t first, you’re last.”
“There are two types of people in the world:
Greeks, and those who wish they were Greek”
Other examples?
How to Counter this Argument
This argument is easy to spot and easy to counter,
simply point out that there are other options to
choose from
“If you ain’t first, you’re last”
Or you could be second, or third, or even fourth
Fallacy #6: Red Herring
 
https://www.youtube.com/watch?v=GLdDQ32ltiA
The speaker deliberately brings up an irrelevant
issue
This is also known as the 
Chewbacca Defense
Any argument that could be a distraction from the
real argument can be considered a Red Herring
More Red Herring examples
 
https://www.youtube.com/watch?v=sT_VhDrn8N
Y
Straw Man
 tactic
Your opponent ignores your argument and sets up an
argument that is easier for them to take down
Husband: “Why are we out of orange juice?”
Wife: “Well you tell me why the dishes aren’t done.”
How to Counter this Argument
To counter the Red Herring or Straw Man argument
you have to point out that your opponent steered
away from the issue
Focus the issue back onto the real topic and keep it
there
Fallacy # 7: Wrong Ending
 
https://www.youtube.com/watch?v=kIv3m2gMgUU
This is known as the slippery slope fallacy
If we allow a reasonable thing, it will inevitably lead to an
extreme version of that thing
This is often used in the debate against gay marriage
Politician: “If we pass laws against fully-automatic
weapons, then it won’t be long before we pass laws on
all weapons, and then we will begin to restrict other
rights, and finally we will end up living in a communist
state.  Thus, we should not ban fully-automatic
weapons.”
Parent: “If I let you get a cell phone then I have to let
your brothers and sisters get a cell phone”
More Wrong Ending examples
 
https://www.youtube.com/watch?v=vRJUvFG8gbE
Post hoc ergo proptor hoc
“after this, therefore because of this”
Also known as the Chanticleer Fallacy
This followed that, therefore that caused this
Sports fan: “I wore my purple sweater and my team
won.  I will always wear my purple sweater on
game days!”
How to Counter this Argument
This one is easy to argue against, but you just have to
be careful to catch the argument
All you have to do to argue against it is point out that
correlation does not cause causation
This works for post hoc ergo proptor hoc
For slippery slope you have to point out that your
opponent has no evidence to support their slippery
slope argument, because it hasn’t happened yet
Response to politician in favor of fully-automatic weapons:
“Where is your evidence to support your claim?”
Also point out how ridiculous their argument is: “Your saying
that limiting the access to fully-automatic weapons is the
same as living in a communist state?”
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A logical fallacy is a deceptive or false argument that relies on bad logic. Learn about common fallacies like the False Comparison and Bad Example, and how to counter them effectively. Enhance your critical thinking skills and avoid falling for flawed reasoning in debates and discussions.

  • Logical Fallacies
  • Critical Thinking
  • Debate Skills
  • False Comparison
  • Bad Example

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  1. LOGICAL FALLACIES

  2. What is a logical fallacy? A fallacy is a deceptive, misleading, or false argument There are many forms of logical fallacies They all have one thing in common bad logic To spot a logical fallacy, ask yourself these questions: Does the proof hold up? Am I given the right number of choices? Does the proof lead to the conclusion? Logical fallacies are not forbidden in debate However, if you are caught using them, there goes your credibility

  3. Fallacy #1: The False Comparison https://www.youtube.com/watch?v=0ak7GZxpF2U The fallacy uses bad proof This fallacy lumps examples into the wrong category Some fruits are purple, this donut has purple, this donut has fruit Other examples: Made with all natural ingredients Break the argument down: Some natural things are good for you, so all natural things must be good But Ebola is natural

  4. More False Comparison examples https://www.youtube.com/watch?v=9NR-SqhJyeU All ducks swim. All fish swim. All ducks are fish. Child: Dad, why don t we have a PlayStation? Everybody else has one. Reductio ad absurdem fallacy If everyone jumped off a cliff, would you do it, too? I m a successful business man. Elect me mayor and I ll run a successful city

  5. How to Counter the Argument All you need to do to counter this argument is find one example to make it false, or show that the two are not the same Purple is a fruit Give the example that an eggplant is not a fruit Everyone else has a PlayStation Name one person who doesn t own a PlayStation Eating lunch and wearing skirts Completely different things

  6. Fallacy #2: Bad Example, or Hasty Generalization https://www.youtube.com/watch?v=owGykVbfgUE This fallacy uses a small sample size to apply to a larger group Synonyms: stereotyping, profiling These could be tricky to spot because the person making the argument might use facts or statistics to support their argument

  7. More Bad Example examples https://www.youtube.com/watch?v=TBnB2AY2_vw LeBron James wears a certain kind of sneaker; buy it and you ll become a basketball star. Got Milk campaign Arizona s immigration law Women are bad drivers

  8. How to Counter this Argument You need to show that the example used was a bad example or led to a hasty generalization You can give examples where the proof doesn t hold up (Say that you have LeBron s shoes and have yet to slam dunk a basketball) Point out that your opponent's hasty generalization is racist, sexist, etc. (note: attack the argument, not your opponent)

  9. Fallacy #3: Ignorance as Proof https://www.youtube.com/watch?v=2Ra8_gyY9R8 Also known as Argumentum ad Ignorantiam This is where you claim that something has not yet been that it is not the case Also, if something has not yet been disproven that it is the case No one has ever provided real evidence that ghosts do not exist; therefore, ghosts exist

  10. More Ignorance as Proof examples Super 8 clip Remember, things cannot be proven without evidence If someone tries to argue that something is true because of a lack of evidence to the contrary they are using the ignorance as proof fallacy Fake scientist: My theory has never been disproven, so it must be true.

  11. How to Counter this Argument Present your opponent with another argument that has never been proven or disproven, and make sure that it is absurd Opponent: I believe in extrasensory perception and UFOs because scientists have never disproved them. You: Scientists have never disproved that toys come to life behind closed doors either. Do you believe that?

  12. Fallacy #4: Tautology The conclusion basically repeats the premise The Cowboys are favored to win since they re the better team Politician: You can trust me because I m an honest man Sportscaster: The way for this team to make a comeback is to score more points You won t have trouble selling this product because it sells itself Anything that is redundant or can be responded with Duh falls into this category

  13. How to Counter this Argument This fallacy is very easy to counter All you have to do is point the redundancy in their argument You can also ask for evidence to better explain the conclusion How are the Cowboys a better team?

  14. Fallacy #5: False Choice, or False Dilemma https://www.youtube.com/watch?v=GgLrMHm32j4 This is used when the number of choices you are given is not the number of choices that actually exist It could be used with a loaded question Attorney: When did you start beating your wife? False Dilemma is when you are made to decide between only two choices Parent: You can either eat liver and onions for dinner, or you can starve to death

  15. More False Choice examples https://www.youtube.com/watch?v=5tW-wqW18rY If you ain t first, you re last. There are two types of people in the world: Greeks, and those who wish they were Greek Other examples?

  16. How to Counter this Argument This argument is easy to spot and easy to counter, simply point out that there are other options to choose from If you ain t first, you re last Or you could be second, or third, or even fourth

  17. Fallacy #6: Red Herring https://www.youtube.com/watch?v=GLdDQ32ltiA The speaker deliberately brings up an irrelevant issue This is also known as the Chewbacca Defense Any argument that could be a distraction from the real argument can be considered a Red Herring

  18. More Red Herring examples https://www.youtube.com/watch?v=sT_VhDrn8N Y Straw Man tactic Your opponent ignores your argument and sets up an argument that is easier for them to take down Husband: Why are we out of orange juice? Wife: Well you tell me why the dishes aren t done.

  19. How to Counter this Argument To counter the Red Herring or Straw Man argument you have to point out that your opponent steered away from the issue Focus the issue back onto the real topic and keep it there

  20. Fallacy # 7: Wrong Ending https://www.youtube.com/watch?v=kIv3m2gMgUU This is known as the slippery slope fallacy If we allow a reasonable thing, it will inevitably lead to an extreme version of that thing This is often used in the debate against gay marriage Politician: If we pass laws against fully-automatic weapons, then it won t be long before we pass laws on all weapons, and then we will begin to restrict other rights, and finally we will end up living in a communist state. Thus, we should not ban fully-automatic weapons. Parent: If I let you get a cell phone then I have to let your brothers and sisters get a cell phone

  21. More Wrong Ending examples https://www.youtube.com/watch?v=vRJUvFG8gbE Post hoc ergo proptor hoc after this, therefore because of this Also known as the Chanticleer Fallacy This followed that, therefore that caused this Sports fan: I wore my purple sweater and my team won. I will always wear my purple sweater on game days!

  22. How to Counter this Argument This one is easy to argue against, but you just have to be careful to catch the argument All you have to do to argue against it is point out that correlation does not cause causation This works for post hoc ergo proptor hoc For slippery slope you have to point out that your opponent has no evidence to support their slippery slope argument, because it hasn t happened yet Response to politician in favor of fully-automatic weapons: Where is your evidence to support your claim? Also point out how ridiculous their argument is: Your saying that limiting the access to fully-automatic weapons is the same as living in a communist state?

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