Magneto has a whole lot of complexity to him. Emotionally, he's coming from a very damaged place. I like the ambivalence of it. I want the audience leaving the theater wondering, asking the questions themselves rather than being spoon-fed like a lot of these super-villain characters.
On the one hand, there is no reason that a black person needs to live a portion of his or her life being concerned about the people of color around him. On the other hand, if you don't you're crazy.
You have all these people in the city and everything has become centralized. If you live outside the city and you need a birth certificate or some official paper from the government, you have to travel to the city.