One common belief among social scientists is that milgram had detected signs of cruelty among his ps, who had used the situation to express their sadistic impulses. This belief was subsequently given substance by the standford prison experiment. Within just a few days, the guards inflicted rapidly escalating cruelty on increasingly submissive prisoners despite the fact there was no obvious authority figure instructing them to do so which suggests that obedience may be due to some fundamental desire to inflict harm on others