Bad reason fallacy

The bad reason fallacy is when an argument has a conclusion and a reason given for it, but the reason is not the kind of reason that could support that conclusion—so the structure fails even if the premises were true. The link between premise and conclusion is missing or irrelevant. It's a formal flaw because the argument form doesn't allow that kind of support, regardless of whether the facts are right.

Examples

• We should keep the park because triangles have three sides.

• The project will succeed because it's Tuesday.

• You should hire her because the sky is blue.