I doubt it. The fraction of population that is murderers is quite small.
It is now. OTOH I have read that an estimated 1/4 of male chimpanzees die at the hands of other chimps (whether murder or war). So it’s not implausible.
If so, you don't have to execute a lot of them to affect the murder rates!
It is now. OTOH I have read that an estimated 1/4 of male chimpanzees die at the hands of other chimps (whether murder or war). So it’s not implausible.