I don't think "all ethnicity are perfectly matched in their potential" is an interesting statement one way or the other. I believe individuals are more interesting than arbitrarily chosen groups. I believe we should judge people on their own merits, rather than choosing groups, taking averages of those groups, and then using those groups to make judgements.
Perhaps in an ideal world, but for better or worse we're currently stuck with everyone looking at ethnic distributions and being really upset about them. Affirmative action, for example, is probably the counterpoint to admissions being about individuals...
