Tit for tat has always been the solution to prisoner's dilemma. The people who think "prisoner's dilemma" means "I should be wholly and utterly selfish, because

Tit for tat has always been the solution to prisoner's dilemma. The people who think "prisoner's dilemma" means "I should be wholly and utterly selfish, because it's the logical thing to do" are just idiots who don't understand how cooperation can work over time and repeated trials to build trust.