[lwouis]

Most people model themselves from their parents and the environment surrounding their youth. Most people are a product of social reproduction. Someone born in a circle is likely to identify with it and remain there.

Yes, there are exceptions. What you call "accident of birth". Statistically, they are uncommon.

[rowanG077]

Judging an individual by statistics of their group is pure discrimination.

[jonathankoren]

So the Marquis de Lafayette isn't democratic patriot in two countries because he was born into the aristocracy?

Statistics part literally doesn't matter. You judge the person by their actions.