Logical Fallacies
Logical Fallacies / Bad Reason Fallacy

Bad Reason Fallacy

The bad reasons fallacy stems from the claim that because the reason(s) given for a certain conclusion are bad therefore the conclusion must also be incorrect. This fallacy supposes that it is not possible to give a bad reason for a correct conclusion. In fact, it is possible to give bad reasoning for a valid conclusion.

Fallacy formula:

  • The reason A given for argument B is bad, therefore conclusion B is not valid

Example of Bad Reason Fallacy

  • Dogs are afraid of heights, therefore dogs don't fly. Though it may be true that dogs are afraid of heights, that is not the reason why they do not fly.
  • Ostrich cannot fly, therefore they are not birds. It is true that ostrich cannot fly, but they are in fact birds.

The reason is true, but it does not lead to the conclusion being drawn.