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Converse accident
 
 
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The logical fallacy of converse accident (also called reverse accident, destroying the exception or a dicto secundum quid ad dictum simpliciter) is a deductive
Deduction

Deduction can refer to one of the following usages: lower price on something* Deductive reasoning, inference in which the conclusion is of no greater generality than the premises...
 fallacy that can occur in a statistical syllogism
Statistical syllogism

A statistical syllogism is an inductive syllogism. Statistics syllogisms may use qualifier words like "most", "frequently", "almost never", "rarely", etc., or may have a statistical generalization as one or both of their premises....
 when an exception to a generalization
Generalization

Generalization is a foundational element of logic and reasoning. Generalization posits the existence of a domain or Set theory of elements, as well as one or more common characteristics shared by those elements....
 is wrongly called for.

For example:
Every swan I have seen is white, so it must be true that all swans are white


The inductive version of this fallacy is called hasty generalization
Hasty generalization

Hasty generalization is a logical fallacy of faulty generalization by reaching an inductive reasoning generalization based on insufficient evidence....
.






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The logical fallacy of converse accident (also called reverse accident, destroying the exception or a dicto secundum quid ad dictum simpliciter) is a deductive
Deduction

Deduction can refer to one of the following usages: lower price on something* Deductive reasoning, inference in which the conclusion is of no greater generality than the premises...
 fallacy that can occur in a statistical syllogism
Statistical syllogism

A statistical syllogism is an inductive syllogism. Statistics syllogisms may use qualifier words like "most", "frequently", "almost never", "rarely", etc., or may have a statistical generalization as one or both of their premises....
 when an exception to a generalization
Generalization

Generalization is a foundational element of logic and reasoning. Generalization posits the existence of a domain or Set theory of elements, as well as one or more common characteristics shared by those elements....
 is wrongly called for.

For example:
Every swan I have seen is white, so it must be true that all swans are white


The inductive version of this fallacy is called hasty generalization
Hasty generalization

Hasty generalization is a logical fallacy of faulty generalization by reaching an inductive reasoning generalization based on insufficient evidence....
. See faulty generalization
Faulty generalization

A faulty generalization, also known as an inductive fallacy, is any of several errors of Inductive reasoning:...
.

This fallacy is similar to the slippery slope
Slippery slope

In debate or rhetoric, a slippery slope is a classical informal fallacy. A slippery slope argument states that a relatively small first step inevitably leads to a chain of related events culminating in some significant impact, much like an object given a small push over the edge of a slope sliding all the way to the bottom....
, 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. A slippery slope argument, in addition, is not necessarily fallacious, where a converse accident is always a formal fallacy
Formal fallacy

In Philosophical logic, a formal fallacy or a logical fallacy is a pattern of reasoning which is always wrong. This is due to a flaw in the structure of the logical argument which renders the argument validity....
.

The opposing kind of dicto simpliciter
Dicto simpliciter

A dicto simpliciter or ad Dictum simpliciter are Latin phrases for a type of logical fallacy. The a is often omitted when this phrase is used in English, being mistaken for an Article ....
 is accident
Accident (fallacy)

The logical fallacy of accident, also called destroying the exception or a dicto simpliciter ad dictum secundum quid, is a deduction fallacy occurring in statistical syllogisms when an exception to the generalization is ignored....
.

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