It is easy to believe that John Yoo wrote his widely discredited “torture memos” because he holds radical views of presidential authority or because he has some unusual moral failing. The reality, however, may be far more ordinary and disturbing: He willfully followed the lead of White House officials who were eager to find a legal justification for torture. The banality of Yoo’s compliance shouldn’t excuse him in any way, but his mistakes can help us understand why attorneys might offer equally troubling legal advice in much less public settings.

We can draw some valuable insights in this regard from one of the most stunning social psychology experiments ever conducted. More than 40 years ago, Stanley Milgram found that, under the right conditions, an experimenter could successfully order more than 60% of adults to administer what they believed to be painful and dangerous electric shocks to an innocent, bound older man with a heart condition, despite the man’s repeated pleas to be let go. In essence, Milgram found that people are surprisingly likely to obey authority figures under certain conditions.