it's all hypothetical. how many of them were actually given the power to fight back afterwards? in most cases, the State seeks revenge (like the U.S. after 911).
anyways...
Magneto actually attempted to start a family after narrowly surviving the Holocaust. then his daughter was burned alive, in front of him. then he went to work at a hospital for Holocaust survivors. he was attacked by a nazi. then he started hunting war criminals for the government. they betrayed him/tried to kill him. the death camps are not where he became the villain of the story. he's who he is because of paranoia, post traumatic stress disorder, and a messiah complex. this has nothing to do with the reputation of the jewish people. i sure as hell wouldn't be ashamed of a black mutant who went on to be an anti-human terrorist after surviving slavery; a mutant Django, if you will.