Social Psychology

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The Lucifer Effect

Understanding How Good People Turn Evil

Why do ordinary people sometimes participate in cruelty, humiliation, and organized violence? Social psychologist Philip Zimbardo argues that explanations centered only on defective character—the proverbial “bad apple”—overlook the power of situations and the institutions that construct them. The book’s central case is the 1971 Stanford Prison Experiment, in which students assigned to prisoner and guard roles occupied a simulated prison until the study was stopped after six days. Zimbardo uses his account of that project to examine conformity, obedience, deindividuation, role absorption, moral disengagement, and the diffusion of responsibility. He then connects these processes to abuses at Abu Ghraib prison and to broader instances of institutional wrongdoing. Although the Stanford study’s methods and interpretation have since faced substantial scholarly criticism, the book remains influential as an argument about how systems distribute power and normalize misconduct. Its final moveme…

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