I like to view our intellect as a tool for survival of our species. By that measure, we are doing fairly well. We used to get wiped out by minor stuff like not enough food, not enough protection from the elements and other animals, diseases, we have eradicated the majority of these things hindering our survival.
I hypothesise that most of the people here (on average) on HN are highly educated. It's kind of fashionable and almost necessary social behavior to be humble in your own intellect. By all objective measures the people on HN are really fucking smart but you can't say that of course because that's "arrogant". Yes, I too think I'm stupid and suffer from impostor syndrome having two graduates degree in applied math.
Anyway, humans, compared to other animals we compete with for survival, food, and territory, are doing really well. I don't see any cows on the moon yet.