Even discounting these, I would still argue that — with respect to the time span of reasonable relevance to any given generation — the spontaneous evolution of a cooperative equilibrium among humans is only just as likely as that of a noncooperative one, unless some restriction is imposed on agents' beliefs.

XREF: Connects to evolutionary game theory and questions about how cooperative equilibria arise without external constraints on beliefs — relevant to social contract theory.

Diego Gambetta, Trust - Making and Breaking…, loc. 2804