[monkeypizza]

The things I mentioned aren't just genetic - culture is also very heritable. So selection will work on that level, too.

The argument about homosexuality is similar to asking why amazon hunters keep getting killed by jaguars - you could "disprove" evolution by asking "why hasn't evolution just selected the ones resistant to jaguars?" But it's because getting as close to danger as possible is an effective strategy. That's one of the more reasonable genetic explanations for for why homosexuality still exists, too.