Well, I think it's an important question to get at the truth of the issue.
I'm no historian, but I managed to walk over some lengthy stretches of world history reading here and there over the years. It appears that caucasian cultures are very different than, say, oriental cultures. As oriental cultures are very similar within themselves, so are caucasian cultures. That is contrasted against those of black, browns and reds, which in turn are contrasted against one another. The rule seems to remain true, alien to one another and similar within one another.
Why are people so afraid of race that they would makes fools of themselves with articles that try to refute what is as plain as a green elephant in a herd of jack rabbits? Sometimes I wonder if they think all people are born complete idiots, and have to complete at least four years at a major US university to acquire intelligence. 