> "Humans evolved to be violent and critical, because the tribes that didn't have that attribute got killed off, conquered, or died of starvation during hard ti

> "Humans evolved to be violent and critical, because the tribes that didn't have that attribute got killed off, conquered, or died of starvation during hard times." Why are you so sure that it was competition and not cooperation that ensured the strength of a tribe? Or to put it another way, could cooperation, even cooperation with those you dislike, also lead to a materially successful tribe?