Why are people so terrified by the thought of the BREEDs (we're all that same race, just different breeds) of human being different? Do you honestly think the only difference between white, black and asian is skin color, big noses, and slanty eyes? Irish are more likely to have red hair and green eyes. Scandinavians are likely to be tall, blond, and blue eyed. Black people are prone to blood pressure issues, naturally develop muscle easier, and have a natural resistance to malaria. Asian people are good at math and are generally short. Is it really so hard to imagine that maybe there is something different about mental faculties between breeds? Why are IQ tests a bad metric? Are they a bad metric because people in general can have largely varying results or are they a bad metric because different breeds score consistently lower? If it's consistent, good or bad, it shows there is an obvious difference. You can argue that the learn different or you can just call them inferior. Different is different; just because we should all be equals doesn't mean we're all the same.