I'm sorry but that logic is horrible, race is not the only thing that separates people; religion, wealth, language, family etc all do too. You do realize that many countries are racially homogeneous and still have discrimination (even worse than the racial discrimination in America), having a bunch of mixed people running around will not solve any problems, they will find others ways to separate, humans a naturally competitive (it's the essence of Capitalism!). People aren't sounding like Nazis or White Supremacist, they are focusing on sticking with their own, who they look like, there is nothing wrong with that, no one is advocating exterminating others that don't look like them or relate to them. People typically build with those they know, who they relate to, and most black people fail to realize that.