One problem I have with X2 is Magneto suddenly, out of nowhere, going from "mutant superiority" to "kill 6 billion humans". It feels like no one really acknowledges that he just attempts to commit genocide on probably 95% of the world's population (that's being generous to the number of mutants). The proper reaction would be "kill this genocidal nutcase on sight" from then on, but there he is just with a pretty minor plan in The Last Stand, and straight up an ally in the future parts of DOFP.
I mean even if you said something like "he figured the X-Men would stop it" (for some reason) every human on the planet being incapacitated for several minutes would have dire consequences even though they stopped it becoming lethal. Pilots, doctors doing surgery, people travelling at high speeds in vehicles, workers handling dangerous materials or operating machinery, etc. Dude probably caused injury or death to thousands of people and no one ever brings that up.