No, it's just game theory. When you're playing prisoner's dilemma games, and your co-player is consistently defecting, you can only play cooperate for so long.

No, it's just game theory. When you're playing prisoner's dilemma games, and your co-player is consistently defecting, you can only play cooperate for so long. Tit for tat is the only way you don't get majorly screwed by the defector over time.