" When the study was over, Milgram sent participants a questionnaire. One question was: how believable did you find the situation? Not until ten years later did he finally publish their answers, in the very last chapter of his book about the experiments. This is where we discover that only 56 per cent of his subjects believed they were actually inflicting pain on the learner. And that’s not all. A never-published analysis by one of Milgram’s assistants reveals that the majority of people called it quits if they did believe the shocks were real.15 So if nearly half the participants thought the setup was fake, where does that leave Milgram’s research? Publicly, Milgram described his discoveries as revealing ‘profound and disturbing truths of human nature’. Privately, he had his doubts. ‘Whether all of this ballyhoo points to significant science or merely effective theater is an open question,’ he wrote in his personal journal in June 1962. ‘I am inclined to accept the latter interpretation.’16 "
― Rutger Bregman , Humankind: A Hopeful History