Racism is controversial because it cuts to the biological essence of us all. Liberals, who are more inclined towards experience over rationality don't like this. They don't like to think of homosexuality or down syndrome as defects either. We must cherish the little films playing in each individual's mind.. their "life experience", their joy and pain. even if that person is a retard who is of no use to anybody. Liberals are all about what happens before the person rots.
Racism sees groups in stages away from monkeys. We are sacks of meat that come in cycles. You are not more important than what will come after you and what is an improvement of you. Every passing day you become more irrelevant. people do not want to believe that all they are is a sack of meat. There is nothing that will make you want to blow out your brains more than the realization, and constant reminder of this fact, and rejection of any illusion that leads you away from this fact.
Superior races don't like the fact much either, but they're looking forward into the future, theyre looking at what they will become. Small slivers of potential give them hope. However they must be reminded that it is all for nothing. The evolution of man will be slow.. and the way it's headed.. disappointing. If we don't get off this planet before the sun explodes everything will be worth nothing. If you disagree, you have a bit of a liberal in you.