I think the problem is that even though people in their heart of hearts know that the chance of IQ distributions being 100% equal between arbitrarily divided groups is impossibly low, we confuse the idea of accepting that with acting upon it. Distinguishing between individuals based on any arbitrary indicators is seen as discrimination. Strictly speaking, it is discrimination in the strictest sense of the word, but the word discrimination is indexed to something intrinsically wrong and immoral, in modern American English at the very least.