There's an interesting thing people say/think about the prospect of having kids in a family where someone was known to have a serious "mental illness". They say, "Aren't you worried that your kids will be [insert mental illness name here]"?
I do think that genes allow for this stuff, but instead of it being a scenario where some humans have it and some humans don't, I think it's a scenario where some species have it and some species don't. The human species has it and the rest don't.
So regarding heritability, it's memes doing the carrying, not genes.
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