" Philip Zimbardo’s study wasn’t just dubious. It was a hoax. My own doubts surfaced on reading Zimbardo’s book The Lucifer Effect, published in 2007. I had always assumed his prison ‘guards’ turned sadistic of their own accord. Zimbardo himself had claimed exactly that hundreds of times, in countless interviews, and in a hearing before the US Congress even testified that the guards ‘made up their own rules for maintaining law, order, and respect’.13 But then, on here of his book, Zimbardo suddenly mentions a meeting with the guards that took place on the Saturday preceding the experiment. That afternoon he briefed the guards on their role. There could be no mistaking his instructions: We can create a sense of frustration. We can create fear in them […] We’re going to take away their individuality in various ways. They’re going to be wearing uniforms, and at no time will anybody call them by name; they will have numbers and be called only by their numbers. In general, what all this should create in them is a sense of powerlessness.14 When I came to this passage, I was stunned. Here was the supposedly independent scientist stating outright that he had drilled his guards. They hadn’t come up with the idea to address the prisoners by numbers, or to wear sunglasses, or play sadistic games. It’s what they were told to do. "
― Rutger Bregman , Humankind: A Hopeful History