but individual variation is always going to trump whatever averages you might find.

This is a meaningless platitude. There is more height variance within a sex, but men are generally taller.

You have your religion: "people are only ever individuals" and work backwards from there. The problem is that we aren't genetically wired to act as individuals.

Judging individuals as individuals is the only good way to navigate the landscape.

No, that's a contrived belief from lolbertarians like yourself, not the world as it is--socially or genetically.

Neither. How about Europe lets people immigrate if they pass a vetting process.

Again, why? That clearly makes the world worse. Do you just not care about the advancement of the third world? Do you not care about the disadvantages of diversity?