Converse accident

Short description: Informal fallacy

The fallacy of converse accident (also called reverse accident, destroying the exception, or a dicto secundum quid ad dictum simpliciter) is an informal fallacy that can occur in a statistical syllogism (an argument based on a generalization), when a rule that applies only to an exceptional case is wrongly applied to all cases in general.

## Example

1. The Tunguska explosion happened in Siberia.
2. Magnitogorsk Iron and Steel Works is in Siberia.
3. This is a bad company to invest in because it's just going to be destroyed by a meteorite.

"If we allow people with glaucoma to use medical marijuana, then everyone should be allowed to use marijuana."

1. People with glaucoma use marijuana.
2. People with glaucoma should be allowed to choose what substances they use.
3. Therefore, all people who use marijuana should be allowed to choose what substances they use.

## Related fallacies

This fallacy is similar to the slippery slope, where the opposition claims that if a restricted action under debate is allowed, such as allowing people with glaucoma to use medical marijuana, then the action will by stages become acceptable in general, such as eventually everyone being allowed to use marijuana. The two arguments imply there is no difference between the exception and the rule, and in fact fallacious slippery slope arguments often use the converse accident to the contrary as the basis for the argument. However, a key difference between the two is the point and position being argued. The above argument using converse accident is an argument for full legal use of marijuana given that glaucoma patients use it. The argument based on the slippery slope argues against medicinal use of marijuana because it will lead to full use.

The inductive version of this fallacy is called hasty generalization. (See faulty generalization.) The opposing kind of dicto simpliciter is accident.

## External links

* Stephen's guide: Converse accident

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Fallacies (list)

Formal|

| In propositional logic|

* Affirming a disjunct
* Affirming the consequent
* Denying the antecedent
* Argument from fallacy

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In quantificational logic|

* Existential
* Illicit conversion
* Proof by example
* Quantifier shift

Syllogistic fallacy|

* Affirmative conclusion from a negative premise
* Exclusive premises
* Existential
* Necessity
* Four terms
* Illicit major
* Illicit minor
* Negative conclusion from affirmative premises
* Undistributed middle

* Masked man
* Mathematical fallacy

Informal|

| Equivocation|

* Equivocation
* False equivalence
* False attribution
* Quoting out of context
* Loki's Wager
* No true Scotsman
* Reification

|

Question-begging fallacies|

* Circular reasoning / Begging the question
* Loaded language
* Leading question
* Compound question / Loaded question / Complex question
* No true Scotsman

Correlative-based fallacies|

* False dilemma
* Perfect solution
* Denying the correlative
* Suppressed correlative

Illicit transference|

* Composition
* Division
* Ecological

Secundum quid
(ignoring qualifications)|

* Accident
* Converse accident

Faulty generalization|

* Anecdotal evidence
* Sampling bias
* Cherry picking
* McNamara
* Base rate / Conjunction
* Double counting
* False analogy
* Slothful induction
* Overwhelming exception

Vagueness / Ambiguity|

* Accent
* Syntactic ambiguity
* Continuum
* Sorites paradox
* False precision
* Moving the goalposts
* Slippery slope
* Quoting out of context

Questionable cause|

* Animistic
* Furtive
* Correlation implies causation
* Cum hoc
* Post hoc
* Gambler's
* Inverse
* Regression
* Single cause
* Slippery slope
* Texas sharpshooter

Fallacies of relevance|

| Appeals to emotion|

* Fear
* Flattery
* Novelty
* Pity
* Ridicule
* Think of the children
* In-group favoritism
* Invented here / Not invented here
* Island mentality
* Loyalty
* Parade of horribles
* Spite
* Stirring symbols
* Wisdom of repugnance

|

Genetic fallacies|

| Ad hominem|

* Abusive
* Association
* Reductio ad Hitlerum
* Godwin's law
* Reductio ad Stalinum
* Circumstantial
* Appeal to motive
* Bulverism
* Poisoning the well
* Tone
* Tu quoque
* Whataboutism

|

* Authority
* Accomplishment
* Ipse dixit
* Poverty / Wealth
* Etymology
* Nature
* Tradition / Novelty
* Chronological snobbery

Appeals to consequences|

* Argumentum ad baculum
* Wishful thinking

* Ad nauseam
* Argument to moderation
* Argumentum ad populum
* Appeal to the stone / Proof by assertion
* Ignoratio elenchi
* Argument from silence
* Invincible ignorance
* Moralistic / Naturalistic
* Motte-and-bailey fallacy
* Rationalization
* Red herring
* Appeal to worse problems
* Two wrongs make a right
* Special pleading
* Straw man
* Cliché
* I'm entitled to my opinion

* Categories
* Fallacies
* Formal fallacies
* Informal fallacies
* List
* Philosophy portal

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Original source: https://en.wikipedia.org/wiki/Converse accident. Read more

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