That sort of information [i.e. facts about "human nature"] can only be found by ordinary empirical research, and ordinary empirical research doesn't need evolutionary psychology for anything else than suggesting interesting hypotheses.

Amen. Evolutionary psychology is generally considered to be pseudo-science by most evolutionary biologists. It amazes me how readily laymen are fooled by this nonsense. Of course we evolved, and of course our adaptations are a result of natural selection. But that doesn't help us to know about ourselves unless we know in detail what the selective environment was, and what kinds of heritable variation was present in our gene pool. And we don't know those things. So why are we so seduced by invented stories about these things?

I sometimes think that we are tempted to draw too much significance from the Darwinian account of our origins, because it replaced the Biblical account of our origin and that account, if it were true, would have all kinds of significance. Just as the natural sciences tend to suffer from "physics envy", I suspect that the humanities all have a bad case of "Scripture envy". We expect our origin stories to be significant, and we can not accept the significance of anything unless it comes attached to an origin story.