People blush when one of their core truths is revealed.
People react predictably, especially when they don't have time to think.
What about my rights? What about a person's privacy? Did all that just go to hell after 9/11?
A jealous husband is an ugly thing.
The good guys had to operate on a higher level than the killers--just for society to keep track of who was who.
But insight doesn't necessarily produce self-control. Sometimes you just see your destructiveness more clearly.