Ignoring? Not at all. I'm just pointing out that the notion of racial differences is so taboo in contemporary academic culture that it's impossible to honestly discuss the question. To honestly address the question, you have to be open to the possibility of any answer, which frankly we aren't. If certain racial differences don't exist, that's fine, but if they did exist, no one would say so anyway. So we can't take the claim that racial differences don't exist at face value, because that's the only palatable conclusion open on the question.

The taboo is a completely understandable and largely inevitable reaction against the open and largely fallacious racist claims of academics in the recent past, but it's still a taboo that inhibits honest inquiry. Perhaps in another 50-100 years.