“But I've come to the conclusion that humans are just fundamentally stupid”

I prefer eventually consistent but ok ;-).

This was my takeaway for a bit but I massaged it into “humans can make better decisions after mistakes”. The differentiator was the focus on getting better, because for me I think I have a proclivity to stew in the “we are all stupid; why try”. If you don’t have that problem then “we are all stupid” works too, and is true :-).