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The Lucifer Effect: Understanding How Good People Turn Evil
...Rather than providing a religious analysis, however, I offer a psychological account of how ordinary people sometimes turn evil and commit unspeakable acts. As part of this account, The Lucifer Effect tells, for the first time, the full story behind the Stanford Prison Experiment, a now-classic study I conducted in 1971. In that study, normal college students were randomly assigned to play the role of guard or inmate for two weeks in a simulated prison, yet the guards quickly became so brutal that the experiment had to be shut down after only six days.

How and why did this transformation take place, and what does it tell us about recent events such as the Abu Ghraib prisoner abuses in Iraq? Equally important, what does it say about the "nature of human nature," and what does it suggest about effective ways to prevent such abuses in the future? ..