Assertion

The fallacy of assertion is when you just state that something is true without giving any reason or evidence. Saying it doesn't make it so. Claims need support—reasons, data, or argument. When someone merely asserts, they're asking you to take it on trust or authority without providing grounds. The fallacy is to treat a bare claim as if it were an argument. The right response is to ask: what's the reason or evidence?

Examples

• This is obviously the best way to do it.

• It's clear that the policy will work.

• Everyone knows that.

• This is the right decision.

• The project will succeed.