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Related: Editorials & Other Articles, Issue Forums, Alliance Forums, Region Forums20 common logical fallacies to learn, identify, and avoid:
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Logical fallacies are errors in reasoning that undermine the quality of an argument.
THREAD: 20 common logical fallacies to learn, identify, and avoid:
Ad Hominem
Latin for "to the person" - an attack of the person rather than the argument.
Instead of addressing the argument and its points and merits, the offender attempts to refute the opposition on the basis of personal characteristics.
All-too-common in politics.
The Texas Sharpshooter
A Texan fires a gun at a barn wall and then paints a target around the closest cluster of bullet holes to create the appearance of accuracy.
Selecting and highlighting evidence that supports the conclusion while ignoring evidence that may refute it.
The Bandwagon Fallacy
An assumption of truth on the basis of the majority of people believing it to be true.
"Everyone believes X, so obviously X is true."
Typically offered without regard for the qualifications or ability of the people in question to validate the claim.
Straw Man
The offender ignores the actual argument and replaces it with a flimsy, distorted, easily-refuted argument (a straw man).
By replacing a strong argument with a weak one, the offender can create the illusion of an easy, swift victory.
Red Herring
The kippered herring was a smelly fish used to distract hunting dogs while training them to stay focused on a scent.
"Red herring" is now synonymous with distraction.
The offender distracts from the argument with a seemingly related (but actually unrelated) point.
Hasty Generalization
Jumping to conclusions.
Material, wide-ranging conclusions are made on the basis of an immaterial, narrow body of evidence.
Insufficient evidence has been gathered to justify the claimed conclusions.
Appeal to Authority
The over-reliance on the perspective of an "expert" to support the legitimacy of an argument.
The qualifications of the authority figure in the field of question must be considered.
Their support can be a feature - but not a pillar - of the argument.
No True Scotsman
The "appeal to purity" - the changing of the original argument to evade a counter-argument.
You claim a Scotsman never drinks scotch with soda. Charles says he is a Scotsman and drinks scotch with soda. You exclaim that Charles must not be a true Scotsman!
Sunk Cost Fallacy
Sunk costs are the economic costs already invested in an activity that cannot be recovered.
The fallacy is found in thinking that you should continue on the basis of all that you've put in, with no regard for future costs or likelihood of ultimate success.
Non-Sequitur
The conclusion does not follow logically from the premises.
Presented evidence provides little or no actual support for the argument.
Charles ate fish for dinner and is well-spoken, so he must be a banker.
False Dilemma
Presenting only two choices or alternatives when there are many more that exist.
Ignores nuance and lends itself to extreme positions.
Typically reduces the potential for compromise, as the two options are painted as being extremely far apart.
Tu Quoque
Latin for you too - attempting to discredit an opponents argument by pointing out personal behavior as being inconsistent with their argument.
Targeting the hypocrisy of the opponent.
Dont question my integrity, look at all of the bad things youve done!
Slippery Slope
An argument that begins with a benign starting point before using a series of successive steps to get to a more radical, extreme end point.
No single step appears ridiculous on the surface, but the connection of multiple steps into a series is highly-improbable.
Begging the Question
A form of circular reasoning in which the argument is presented in such a way that the conclusion is included in the premise.
Ghosts are real because I once experienced something that had to be a ghost.
Easy to identify. The logic collapses on itself.
Loaded Question
Asking a question with a presumption built into the question (pre-loaded!).
Typically intended to be inflammatory in nature.
The individual on the receiving end of the question is forced to respond despite the baseless, irrelevant nature of the presumption.
Post Hoc Ergo Propter Hoc
Argues that since Event B followed Event A, Event B must have been caused by Event A.
Just because B followed A, doesnt necessarily mean that B was caused by A.
Correlation ≠ Causation.
Equivocation
Comes from the roots equal and voice - a single word or phrase can say two very different things.
Occurs when the offender uses a word or phrase in an intentionally misleading manner that sounds like its saying one thing but is actually saying something else.
Personal Incredulity
You are unable to understand or believe something, therefore you argue that it cannot be true.
Complex topics often require significant upfront work to understand, so an inability to understand cannot be used to argue the illegitimacy of a claim.
Burden of Proof
The inability to provide evidence that a claim is false is used as justification that the claim is true.
The burden of proof lies with the person making the claim to provide supporting evidence.
The lack of refuting evidence is not supporting evidence.
The Fallacy Fallacy
Incorrectly assumes that a claim must be false if a fallacy was used to argue the claim.
Just because someone has poorly argued a claim, does not mean the claim itself is definitively false.
So those are 20 common logical fallacies to learn, identify, and avoid.
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smirkymonkey
(63,221 posts)Thank you!
Bookmarking!
Nevilledog
(51,104 posts)niyad
(113,303 posts)Silent3
(15,212 posts)...it's not just something for the debate team.
Understanding how to recognize and avoid logical fallacies needs to be considered just as basic and essential as literacy and numeracy, along with understanding other basic pitfalls of human thinking, such as confirmation bias.
Of course, if these skills really were taught seriously, it would undermine religious teachings. I'm sure that's one reason such an educational program hasn't been widely embraced.
rpannier
(24,329 posts)Mr. Evil
(2,844 posts)Leave it to DU to promote logic and reason. Forcing such things down our throats just makes everyone here more liberal, educated and better prepared for an argument. I mean, the nerve! Like we would ever be able to use this rationale against the warped reasoning of a republican. Why, they'll probably post something else later this morning that will also prove useful against the republican zombie apocalypse death cult shitstorm.
And I fucking love it! Great post!
(bookmarked just in case I need an emergency refresher)
rpannier
(24,329 posts)(The oldest both Korea and Japan, the twins Japan)
They're really knowledgeable in these
It's a really good skill to have
Thanks for posting
Moebym
(989 posts)ProudProgressiveNow
(6,129 posts)William Seger
(10,778 posts)These common fallacies have been given names because they occur so frequently, but identifying faulty logic does not necessarily involve categorizing and sticking a label on it. What we would really like to know is what makes a "valid" logical inference and what makes a "sound" argument, and their definitions are surprisingly easy to state.
A logical inference is said to be valid if the conclusion necessarily follows from the premises, in the sense that if the premises are true, then the conclusion cannot be false. A sound argument is one in which the premises are actually true.
If an argument doesn't meet both those criteria, then there is a fallacy somewhere, whether or not one can call it by its common name. Easier said than done, of course, but the two important questions to ask are: how credible are the premises (including any that are not explicitly stated); and is there any way the conclusion might be false even if those premises are true.
underpants
(182,803 posts)Bookmarked