Genetics is messy - as I understand it most genes don't code for a single thing, so assuming evolution is "selecting for schizophrenia" that only implies that there is an evolutionary benefit to some of the things controlled by the same gene(s) that control schizophrenia, that outweighs the disadvantage of schizophrenia. Homosexuality is interesting from this perspective too - common enough that evolution has to be s…
I always wondered if it was natures check on overpopulation. I know that is controversial to say, but it seems most fitting on its face
I don't think we're at the point yet, and certainly not in last few million years of evolution, where overpopulation is an issue, and since evolution is all about (collectively) creating the largest next-generation population, this isn't the way I would expect to see increased competition for resources to play out.