I think this is a hard truth to accept for people of any political persuasion. A lot of right wing ideology rests on the idea that anyone can pull themselves up by their own bootstraps and make it.

One could see this as a rallying cry for communism "From each according to his ability, to each according to his need".

I think the left has a tacit acknowledgement that those who cannot support themselves should be supported by society.

Does the fact that a certain group is genetically predisposed to some condition mean we should discriminate against that entire group? I think the answer is obviously not.

The question of diversity gets messy if you assume that this is because everyone is equally qualified and the current state of affairs is only due to discrimination, rather than seeing it as a way to improve society-wide outcomes.

It's a messy topic since much of today's discourse is based on the idea that we are or should be equal when that is clearly not the case, but we keep the fiction going to avoid looking too closely because it is uncomfortable for everyone.