Please stop referring to "blacks"? I swear to God it's not PC-ness that's prompting this comment; it's my nerdy inability not to bristle at a sentence that misunderstands something so fundamentally.
I would avoid generalizing about black people in America. You might be thinking about "the black urban underclass". Those people are very different from "black investment bankers".
Then I call total BS, because no upper middle class black person that I know is "constantly looking over their shoulder", at least not in any way that upper middle class white people do already.
I'm going to be done discussing this now; I'm happy to read anything you write in response, but this is one of those super-unproductive discussions that is inevitably going to embarrass me in a year.