Thread:RedSilver01/@comment-26216332-20160808071220/@comment-29417418-20160813155133

Because, Magneto witnessed his own mother's death. She was standing right behind him, and Shaw shot her, when he couldn't move the coin. Havoc, Mystique, Beast, Charles, and Magneto found out about their teammates death somehow. I don't know what happened to Riptide after X-Men First Class. He was there, when the police shot his wife and daughter in the crossfire, and used his daughter's necklace to kill the police in revenge. So in a word, Magneto is a broken man, with nothing left to lose, not knowing that Peter is his own son.