I would be careful with that logic. Yes, we're social animals. But a case could be made we're every bit the sociopathic apes that you're attributing to capitalist conditioning.

Yes, ancient pre-agrarian societies were socialist/communistic. Property mostly shared communally. Land ownership not really a thing. General egalitarianism. But that was WITHIN THE GROUP. Sure, we shared well with those in our family or clan, but inter-group conflict was brutal. The portion of people in these ancient societies that met violent deaths is orders of magnitude more than our current world.

If I were to describe and generalize how ancient societies behaved, it would be "saintly socialism to those in the group, murderous cannibalism to those outside the group."