'The poor performance of African-Americans has more to do with the fact that their culture... '

And what culture would that be exactly? The culture based on oppression and discrimination that has forced African-Americans to by and large live as second-class citizens? Isn't it a reasonable goal to develop that culture, along with the expectations that come with it?
I am not sure what point you are trying to make. Your comment seems a bit self-defeating. We can argue about what are appropriate measures to encourage the development of that culture, but the goal itself doesn't seem inappropriate, unless of course YOUR goal is to maintain the status quo. Personally, I don't necessarily see it as a 'us vs. them' issue; it is not a zero sum game here. Your comments come across as based on a somewhat misguided cultural superiority complex.