[gt_]

It is a 'winning strategy' only for the winners. We can just as well call it a 'losing strategy'. As the players become more intelligent, they are able to cooperate better and everyone wins, meaning cooperation is even 'more winning'. That is, unless your intentions here are something like eugenics.

[duckingtest]

It's only possible for everyone to win if basic resources are infinite. Tribalism is the only pareto optimal strategy for finite resources, especially land on Earth.