Well, I could have told you that.
Ever managed to run down and slay a gazelle baer-footed and empty handed? Ever managed to light a fire without tinder or spark using only your sheer primal manliness? Though not. It was clearly a mistake to come down from the trees and start using tools. We've become more and more dependent on man-made litter every since.
Possibly even the trees were a bad idea, and we should never have left the oceans.
Now, who was the origin of that little quote, I wonder... tip of my tongue...