Humans can not “move on” from human nature no matter how much people try to will it
Do you mean porpoises?
Dolphins are not known for mistreating tortoises but porpoises.
(To be clear, not targeting you personally here, but targeting the rhetoric and fallacy)
If everyone else is defecting and you can cooperate with a few people, that's slightly better for you. Hence we have high-trust and low-trust societies, gatekeeping, etc.
If there's no pure play dominant strategy, you will always get a fraction of defectors willing to try their luck. But coopération still emerges, and the polities that manage to cooperate more still tend to survive and thrive more.