@Francis,
The "collective wisdom of mankind" has to be the ultimate oxymoron! In fact if there can be said to be human logicality, it lies with the individual and not with the masses! Your misplaced optimism is the typical human condition of nada logicality. I can list a plethora of goober-related reasons but I'll list just a few:
Given man's penchant for massively unstable/excessive global populations and the inevitability of weather pattern changes, man is poised for cycles of famine with all that famine implies such as war, ecological destruction, extinction. We are going to **** ourselves, and consume ourselves, and fight ourselves to death.
There is scant long term evidence that man in larger groups acts to maximize overall survival potential, in fact just the opposite is in evidence as per nada logicality.
There is scant evidence that man's increased intelligence is an aid to maximizing overall long term survival potential, in fact just the opposite is in evidence as per nada logicality.