Fixing human biology is easy, but the game theory that often pushed the biology there in the first place can be far more tricky.

Yes, you are probably right about that. Still, "tricky" is not the same as "impossible". Humans have made sweeping social changes before, after all; for example, outright slavery is considered to be immoral by a large proportion of humans currently living on Earth, which did not use to be the case in the past. Though, admittedly, such changes would probably be more difficult to effect than, say, the cure for Alzheimers...