Has done more wrong than good. He thinks is helping people but in reality he is ruining there lives with the crimes he is committing. Montag is a firefighter he burns houses with books in them. Having books in your possession is illegal. Montag takes books and reads them.
Montag has committed murder and that does not make him a hero it makes him a villain. After he murder his boss he ran not taking the consequence for his actions. Then he went on the run and later an innocent man had taken the fall for his crime. In our world that is no hero.
Montag also framed his co-workers, he planted books in their homes and yards to be found and later there house were