It's said that "The only thing necessary for the triumph of evil is for good men to do nothing." https://quoteinvestigator.com/2010/12/04/good-men-do/
Consider this literally. Many rejoice when fascists are incompetent and devoid of knowledge or skill, and hope that fascists/fascism will self-destruct. This is a false hope.
So long as antifascists fail to take meaningful action and exploit opportunities, fascists without opposition can screw up constantly with no consequences, or only to be replaced with something worse.