The us and them mentality being used to "combat" terrorism is so harmful because it puts people in a position where they have nothing to lose - they're already being discrimminated against etc.
I agree that a few assholes can ruin things for everyone but the reason they can is because they can ruin the trust people have in each other thereby leading to a situation like I described above. The solution is therefore counterintuitive (since they exploit intuition).
http://www.npr.org/templates/story/story.php?storyId=4256591
What do you mean by this? It sounds a bit ominous, if you'll pardon me.