Mutants are people were, most commonly at puberty, has a change different of that of a normal human. These changes affect their growth and gives them powers. These powers could be used for good, or evil. Now, a lot of humans hate mutants. They kill many mutants just because they are different. They hunt mutants, throw things at them, make fun of them, torture them, and more. Charles Xavier's X-men are a team of mutants to protect the people who hate them. Magneto takes a different route, he takes the offensive on the people who hate him. What he is doing is self-defense. What he is doing is trying to make civil-rights for mutants. But for him, he is trying to do this with violence. I dont keep track everytime Magneto comes in a comic so I dont know if some writer made him rob a bank, but from what I see he isn't evil.