The PD is important because it's mostly the rational selfish actors who we need to worry about. Irrationally altruistic actors are rare, and irrational selfish

The PD is important because it's mostly the rational selfish actors who we need to worry about. Irrationally altruistic actors are rare, and irrational selfish actors tend to self-immolate or get arrested quickly. Many things go on during church socials that don't require any problem-solving on the part of game theorists; because widespread altruism is already a solution, just the hardest solution to actually get to.