I did not mean to dismiss GP's argument simply because it appealed to game theory. In fact, GP did not have an argument at all - they just dismissed the article's historical description by simply saying "game theory explains that better" without any additional explanation, and then proceeded to make claims about human psychology presumably on the same basis.

Thanks for the pointer to the article. Game theory is an extremely valuable tool and model, it is just not the ultimate word on human behavior, at least as it stands today.