Riiiighht like when he kills other mutants and take over this bodies and powers? Oh like when he wanted to have Quicksilver executed? Come on now.
He doesn't take power from killed mutants, where did you got that BS?
He merged with some mutants (mutants being alive, not killed by him), by trasferring his consciousness.
I'm here now, come on.
He doesn't kill Pietro, but agree in second half of movie he behavior a little like present arab terrorist. Orders to kidnapped man (Xavier) say some words to the whole world, next wants someone to cut throat for slain (Quicksilver).
Just realized he upgraded Xavier for a moment, when Charles could contact with everybody at Earth without Cerebro.