When writers give a villain a completely sound motivation/or just makes them right and then is forced to make them do something horrible to get you to not sympathize with them.
How do you make a Holocaust survivor who doesn’t want his people genocided AGAIN, into a villain? The Magneto Effect.
Humanity: Builds weapons of mutant genocide
Magneto: I don’t like that
An underground society spanning the United States of America. The Magnet People's mission is currently unknown to the public. But one day they shall rise to the public eye. Fear not. We come in peace.
Dan: WHAT ARE THEY DOING!?
Josh: Don't worry mate. They are The MagnetPeople. They come in peace.