What do you think the next 'justifiable' reason to commit genocide will be?

So far historically it was "they're not Christians", then it was "wrong location" (cause they wanted the land/resources), then it was "they're not the right race", then it was "wrong economic system", and now it's "wrong culture"; what's next do you think?

EDIT: By justifiable I don't mean it's actually justifiable, I mean most people will consider it justifiable.