A lot of things make much more sense (with some accompanying loss of hope) when you realize that humanity is about as dumb as it’s possible for a species to be and still develop a sophisticated technological civilization. We’re right on the ragged edge of what our species’ biology allows.

This follows from the simple fact that evolution happens on much longer timelines than human history. We’re pretty much the same animals as we were before the invention of agriculture. Once we had enough brain, we almost instantly went from flint arrowheads to inventing computers and hydrogen bombs and mortgage-backed securities. Of course we’re just barely mentally hanging on trying to handle all of it.