http://chronicle.com/article/Era-in-Ideas-Terrorism/128490/
His conclusion,
"Even when they are not rooted out by states, terrorist groups carry the seeds of their own destruction. As they become frustrated by their lack of progress and as their audiences start to get bored, they escalate their tactics. They start to target victims who are more famous, more sympathetic, or simply more numerous. That certainly gets people's attention, but not in the way the terrorists intend. Supporters are repulsed by the "senseless violence" and withdraw their money, their safe havens, their reluctance to cooperate with the police, and their resistance to an all-out crackdown.
Audrey Cronin nicely captures the conflicting moral psychology that defines the arc of terrorist movements: 'Violence has an international language, but so does decency.'"
May decency win...soon.