People will kill if an authority figure tells them to.

In an experiment done by someone or other on human relations to authority, they put volunteers into a room with a guy in a white coat and were told to press a button that they were told would give another person in a room separated from theirs by a glass window an electric shock. In reality it would play back recordings of actors screaming in pain while the actor they could see writhed relative to the level of the shock. They would go and shock the person even past lethal levels as long as the person in the white coat, whom the subject would assume is a doctor, told them to. As they neared the lethal level, many would get nervous and joke about it or ask to stop, but after some gentle prodding by the doctor they would continue to press higher and higher voltages even after the shockee stopped responding orally (that is, no sound would be getting played back and the actor would slump over and not move). This proves that humans are willing to do a lot when there's an authority telling them to.

http://en.wikipedia....gram_experiment

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