They don’t think it’s a joke, they’re quite serious.
In “SuperCooperators,” Nowak argues that two of his mechanisms, indirect reciprocity and group selection, played an important role in human evolution. Think of a proto-simian trying to figure out whether to trust another in an exchange: Should I provide sex now for food and protection later? The proto-simian may have observed the behavior of its prospective partner, or it may not have; chances are good that others have, though. Reputation becomes important. The proto-simian evolves into a hominid, with a bigger brain allowing for more precise communication about reputation. Moral instincts evolve to produce shame, guilt, trust, empathy; social intelligence and conscience are born. Before you know it, Yogi Berra is summing it all up: “Always go to other people’s funerals, otherwise they won’t come to yours.” Language, cognition and morality, Nowak argues, are evolutionary spinoffs of the fundamental need of social creatures to cooperate.