Well, this is interesting because, subset of people deciding one is "radioactive" is very small compared to whole society, but in general the society is selforganized. There is no oppression. People have money and power because other people give it to them.

I guess people collecitvely want to have black characters in power to do the dirty, making their live easier overall. I don't see other reason "western" societies don't change people in power when they actually can.