The Villain Sucks

Even evil can be bad at what it's supposed to do.

This might be because the Villain is a Joke Villain, the Jerkass, or some other role that fails in the villainy department. Their henchmen might get tired of their failure-at-everything attitude and quit the job. The Hero might even call the Villain pathetic. The worst thing that could happen to the Villain is if the people they're suppose to intimidate laugh at them and don't feel threatened by them any longer.

If they become aware of how they suck, the Villain may quit being an antagonist and might try to live a more peaceful life like a civilian. The Good Guys may see the Villain and try to fight them, only to hear that they quit. They rarely try to help the Villain get back into the evil spirit and return to being their sworn enemy.