Thanks for the tip on the Zimbardo experiment. I've just had a look at the slideshow presentation:
(in Windows environment, use F11 to maximise the screen)
This particular episode regarding Prisoner #819 was very relevant:
"While talking to us, he broke down and began to cry hysterically....... I took the chain off his foot, the cap off his head, and told him to go and rest in a room that was adjacent to the prison yard. I said that I would get him some food and then take him to see a doctor.
While I was doing this, one of the guards lined up the other prisoners and had them chant aloud: "Prisoner #819 is a bad prisoner. Because of what Prisoner #819 did, my cell is a mess, Mr. Correctional Officer." They shouted this statement in unison a dozen times.
As soon as I realized that #819 could hear the chanting, I raced back to the room where I had left him, and what I found was a boy sobbing uncontrollably while in the background his fellow prisoners were yelling that he was a bad prisoner. No longer was the chanting disorganized and full of fun, as it had been on the first day. Now it was marked by utter confomity and compliance, as if a single voice was saying, "#819 is bad."
I suggested we leave, but he refused. Through his tears, he said he could not leave because the others had labeled him a bad prisoner. Even though he was feeling sick, he wanted to go back and prove he was not a bad prisoner.
Chillingly relevant. Recommended viewing.