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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 fallacy that can occur in a statistical syllogism when an exception to a generalization 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. See faulty generalization.

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. A slippery slope argument, in addition, is not necessarily fallacious, where a converse accident is always a formal fallacy.

The opposing kind of dicto simpliciter is accident.

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