Cooporation or Logicalness? (Score 1)

If you didnt cooperate from the beginning, its just logical that you would lose the trust of the other person. Then both of them would begin to defect to ensure gaining something at least. Why would anyone not want to get the most out of it by trying to cheat the other when its obvious it would just backfire? The test did give results, but I dont think for the right reason.