Because, sadly enough, nuance doesn't sell, bizarre sells.And I would no problem with this if It was nuanced. I have often found the problem being a race thing to be utterly bizarre? Why not class? IE companies preferring to hire people with superpowers rather then normal people. Or Rich people buying super powers? Because some superpowered people can do the job of ten or a hundred normals. Instead we get magneto who can't tell the difference between hitler using Jews as scapegoats for societal problem and normal people being justifiably afraid of mutants and them actually causing some problems.