On the other hand, I was reading through Stanley Milgram's Obedience some time ago (a book about his famous experiment http://en.wikipedia.org/wiki/Milgram_experiment).

One interesting part was, that in some of the minds of the subjects ("teachers"), the "learner" could not do or say anything to "convince the teacher to stop". This is almost direct quote from a woman which was a hospital sister in real life. So she wasn't evil; she just was conditioned to not consider "learner" as a human being (or his opinion).

So that before we morally judge others..