Holy cow: it's the race card in a scientific discussion.....
We'll never know the truth. Any conclusion is hostage to the racial politics....
It was only a throwaway comment at the end, and you were the one who brought race into this in the first place!
I agree, we are unlikely to completely know the truth, but thats because our knowledge of the complex interplay of genetics and environment is incomplete, to say the least, not because Im asking anyone to bow to political correctness over ethnicity.