List of fallacies

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A fallacy is the use of invalid or otherwise faulty reasoning in the construction of an argument. All forms of human communication can contain fallacies.

Contents

Because of their variety, fallacies are challenging to classify. They can be classified by their structure (formal fallacies) or content (informal fallacies). Informal fallacies, the larger group, may then be subdivided into categories such as improper presumption, faulty generalization, error in assigning causation, and relevance, among others.

The use of fallacies is common when the speaker's goal of achieving common agreement is more important to them than utilizing sound reasoning. When fallacies are used, the premise should be recognized as not well-grounded, the conclusion as unproven (but not necessarily false), and the argument as unsound. [1]

Formal fallacies

A formal fallacy is an error in the argument's form. [2] All formal fallacies are types of non sequitur .

Propositional fallacies

A propositional fallacy is an error that concerns compound propositions. For a compound proposition to be true, the truth values of its constituent parts must satisfy the relevant logical connectives that occur in it (most commonly: [and], [or], [not], [only if], [if and only if]). The following fallacies involve relations whose truth values are not guaranteed and therefore not guaranteed to yield true conclusions.
Types of propositional fallacies:

Quantification fallacies

A quantification fallacy is an error in logic where the quantifiers of the premises are in contradiction to the quantifier of the conclusion.
Types of quantification fallacies:

Formal syllogistic fallacies

Syllogistic fallacies – logical fallacies that occur in syllogisms.

Informal fallacies

Informal fallacies – arguments that are logically unsound for lack of well-grounded premises. [14]

Improper premise

Faulty generalizations

Faulty generalization – reaching a conclusion from weak premises.

Questionable cause

Questionable cause is a general type of error with many variants. Its primary basis is the confusion of association with causation, either by inappropriately deducing (or rejecting) causation or a broader failure to properly investigate the cause of an observed effect.

Statistical fallacies

  • The observational interpretation fallacy occurs when associations identified in observational studies are misinterpreted as causal relationships.
  • Regression fallacy – ascribes cause where none exists. The flaw is failing to account for natural fluctuations. It is frequently a special kind of post hoc fallacy.
  • Gambler's fallacy – the incorrect belief that separate, independent events can affect the likelihood of another random event. If a fair coin lands on heads 10 times in a row, the belief that it is "due to the number of times it had previously landed on tails" is incorrect. [61]
    • Inverse gambler's fallacy – the inverse of the gambler's fallacy. It is the incorrect belief that on the basis of an unlikely outcome, the process must have happened many times before.
  • p-hacking – belief in the significance of a result, not realizing that multiple comparisons or experiments have been run and only the most significant were published.
  • Garden of forking paths fallacy – incorrect belief that a single experiment can not be subject to the multiple comparisons effect.
  • Sunk costs fallacy - refusal to leave a situation because you have already put large amounts of time or effort into it- for example trying to jump over a wall you physically cannot jump over because you have already spent an hour trying to jump.

Relevance fallacies

Red herring fallacies

A red herring fallacy, one of the main subtypes of fallacies of relevance, is an error in logic where a proposition is, or is intended to be, misleading in order to make irrelevant or false inferences. This includes any logical inference based on fake arguments, intended to replace the lack of real arguments or to replace implicitly the subject of the discussion. [70] [71]

Red herring – introducing a second argument in response to the first argument that is irrelevant and draws attention away from the original topic (e.g.: saying "If you want to complain about the dishes I leave in the sink, what about the dirty clothes you leave in the bathroom?"). [72] In jury trial, it is known as a Chewbacca defense. In political strategy, it is called a dead cat strategy. See also irrelevant conclusion.

  • Ad hominem – attacking the arguer instead of the argument. (Note that "ad hominem" can also refer to the dialectical strategy of arguing on the basis of the opponent's own commitments. This type of ad hominem is not a fallacy.)
    • Circumstantial ad hominem – stating that the arguer's personal situation or perceived benefit from advancing a conclusion means that their conclusion is wrong. [73]
    • Poisoning the well – a subtype of ad hominem presenting adverse information about a target person with the intention of discrediting everything that the target person says. [74]
    • Appeal to motive – dismissing an idea by questioning the motives of its proposer.
    • Tone policing – focusing on emotion behind (or resulting from) a message rather than the message itself as a discrediting tactic.
    • Traitorous critic fallacy (ergo decedo, 'therefore I leave') – a critic's perceived affiliation is portrayed as the underlying reason for the criticism and the critic is asked to stay away from the issue altogether. Easily confused with the association fallacy (guilt by association) below.
    • Bulverism (psychogenetic fallacy) – inferring why an argument is being used, associating it to some psychological reason, then assuming it is invalid as a result. The assumption that if the origin of an idea comes from a biased mind, then the idea itself must also be a falsehood. [37]
  • Appeal to authority (argument from authority, argumentum ad verecundiam) – an assertion is deemed true because of the position or authority of the person asserting it. [75] [76]
    • Appeal to accomplishment – an assertion is deemed true or false based on the accomplishments of the proposer. This may often also have elements of appeal to emotion see below.
    • Courtier's reply – a criticism is dismissed by claiming that the critic lacks sufficient knowledge, credentials, or training to credibly comment on the subject matter.
  • Appeal to consequences (argumentum ad consequentiam) – the conclusion is supported by a premise that asserts positive or negative consequences from some course of action in an attempt to distract from the initial discussion. [77]
  • Appeal to emotion – manipulating the emotions of the listener rather than using valid reasoning to obtain common agreement. [78]
    • Appeal to fear – generating distress, anxiety, cynicism, or prejudice towards the opponent in an argument. [79]
    • Appeal to flattery – using excessive or insincere praise to obtain common agreement. [80]
    • Appeal to pity (argumentum ad misericordiam) – generating feelings of sympathy or mercy in the listener to obtain common agreement. [81]
    • Appeal to ridicule – mocking or stating that the opponent's position is laughable to deflect from the merits of the opponent's argument. [82]
    • Appeal to spite – generating bitterness or hostility in the listener toward an opponent in an argument. [83]
    • Judgmental language – using insulting or pejorative language in an argument.
    • Pooh-pooh – stating that an opponent's argument is unworthy of consideration. [84]
    • Style over substance – embellishing an argument with compelling language, exploiting a bias towards the esthetic qualities of an argument, e.g. the rhyme-as-reason effect [85]
    • Wishful thinking – arguing for a course of action by the listener according to what might be pleasing to imagine rather than according to evidence or reason. [86]
  • Appeal to nature – judgment is based solely on whether the subject of judgment is 'natural' or 'unnatural'. [87] (Sometimes also called the "naturalistic fallacy", but is not to be confused with the other fallacies by that name.)
  • Appeal to novelty (argumentum novitatis, argumentum ad antiquitatis) – a proposal is claimed to be superior or better solely because it is new or modern. [88] (opposite of appeal to tradition)
  • Appeal to poverty (argumentum ad Lazarum) – supporting a conclusion because the arguer is poor (or refuting because the arguer is wealthy). (Opposite of appeal to wealth.) [89]
  • Appeal to tradition (argumentum ad antiquitatem) – a conclusion supported solely because it has long been held to be true. [90]
  • Appeal to wealth (argumentum ad crumenam) – supporting a conclusion because the arguer is wealthy (or refuting because the arguer is poor). [91] (Sometimes taken together with the appeal to poverty as a general appeal to the arguer's financial situation.)
  • Argumentum ad baculum (appeal to the stick, appeal to force, appeal to threat) – an argument made through coercion or threats of force to support position. [92]
  • Argumentum ad populum (appeal to widespread belief, bandwagon argument, appeal to the majority, appeal to the people) – a proposition is claimed to be true or good solely because a majority or many people believe it to be so. [93]
  • Association fallacy (guilt by association and honor by association) – arguing that because two things share (or are implied to share) some property, they are the same. [94]
  • Logic chopping fallacy (nit-picking, trivial objections) – Focusing on trivial details of an argument, rather than the main point of the argumentation. [95] [96]
  • Ipse dixit (bare assertion fallacy) – a claim that is presented as true without support, as self-evidently true, or as dogmatically true. This fallacy relies on the implied expertise of the speaker or on an unstated truism. [97] [98] [99]
  • Chronological snobbery – a thesis is deemed incorrect because it was commonly held when something else, known to be false, was also commonly held. [100] [101]
  • Fallacy of relative privation (also known as "appeal to worse problems" or "not as bad as") – dismissing an argument or complaint due to what are perceived to be more important problems. First World problems are a subset of this fallacy. [102] [103]
  • Genetic fallacy – a conclusion is suggested based solely on something or someone's origin rather than its current meaning or context. [104]
  • I'm entitled to my opinion – a person discredits any opposition by claiming that they are entitled to their opinion.
  • Moralistic fallacy – inferring factual conclusions from evaluative premises, in violation of fact–value distinction; e.g. making statements about what is, on the basis of claims about what ought to be. This is the inverse of the naturalistic fallacy.
  • Naturalistic fallacy – inferring evaluative conclusions from purely factual premises [105] [106] in violation of fact–value distinction. Naturalistic fallacy (sometimes confused with appeal to nature) is the inverse of moralistic fallacy.
  • Naturalistic fallacy fallacy [108] (anti-naturalistic fallacy) [109] – inferring an impossibility to infer any instance of ought from is from the general invalidity of is-ought fallacy, mentioned above. For instance, is does imply ought for any proposition , although the naturalistic fallacy fallacy would falsely declare such an inference invalid. Naturalistic fallacy fallacy is a type of argument from fallacy.
  • Straw man fallacy – refuting an argument different from the one actually under discussion, while not recognizing or acknowledging the distinction. [110]
  • Texas sharpshooter fallacy – improperly asserting a cause to explain a cluster of data. [111]
  • Tu quoque ('you too' – appeal to hypocrisy, whataboutism) – stating that a position is false, wrong, or should be disregarded because its proponent fails to act consistently in accordance with it. [112]
  • Two wrongs make a right – assuming that, if one wrong is committed, another wrong will rectify it. [113]
  • Vacuous truth – a claim that is technically true but meaningless, in the form no A in B has C, when there is no A in B. For example, claiming that no mobile phones in the room are on when there are no mobile phones in the room.

See also

References

Citations

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Sources

Further reading

The following is a sample of books for further reading, selected for a combination of content, ease of access via the internet, and to provide an indication of published sources that interested readers may review. The titles of some books are self-explanatory. Good books on critical thinking commonly contain sections on fallacies, and some may be listed below.