I came across this article of Paulo recently. He talks about "Human nature" in that and it is more or less true.
I've had a similar experience. When Dr.Rajkumar died, violence erupted here in bangalore. Since the people are roaming as a group, they were expressing their hidden instincts which are, broking the glasses, burning the vehicles etc. Since they move as a group, they got a confidence to do these things (which as an individual they won't do). Those were horrible 2 days here without getting transportation, proper food etc.
Paulo finished it well with "all a matter of control".