That's not really where it started, though. I think that's pretty much irrelevant in the sense that I have seen fucking millionaire spawns, people who never have to interact with illegal scum be just as miserable.
Like this guy, his family was all doctors and lawyers. They lived in the poshest of posh places where there were no Muzzies. None. He was still depressed as fuck.

It's really not about that. They are discouraged from standing out and such. It's considered kind of... uncomfortable if you are above average, outspoken or ambitious. They could have literally zero rapes, but the fact that you are supposed to be so muted at all times kills the drive of anyone.
Being too happy or proud is vanity and insensitive. Being too driven is being pushy and greedy. Just be sensitive to others and don't stand out.