Why would it? Evolution cares about only "fitness", which is the ability to survive and reproduce. It doesn't care about intelligence or happiness or health or

Why would it? Evolution cares about only "fitness", which is the ability to survive and reproduce. It doesn't care about intelligence or happiness or health or anything else except to the extent that these things promote survival and reproduction. Current human populations are actually being somewhat negatively selected for intelligence, since at least in the developed world fertility is inversely correlated with education (except at the insignificant extreme high end).