It's also worth noting that nearly all of these examples are extremely rare. Homosexuality is the most common one, and as current research suggests a genetic co

It's also worth noting that nearly all of these examples are extremely rare. Homosexuality is the most common one, and as current research suggests a genetic component it seems likely that with further information it will ultimately make sense, if not as an adaptive trait, at least as a consequence of adaptive traits. The others are indeed examples of memes overpowering genes, and an evolutionary model (of memes) can help to explain them as well. It's not a well-developed field to be sure, but it's a worthwhile perspective. A cartoony example is religions that ban sex vs religions that ban contraception - given that religious memes are strongly conserved in offspring, which meme would you expect to spread better? How does that compare to what we actually see?