There are those that decry the execution of Bin Laden. They say that killing people never solved anything, and never got us anywhere.
If that's the case, why do terrorists kill people?
Terrorists want something - money, power, glory, fame, whatever. They believe that they will get what they want if they kill people. They believe killing people is an effective way to get things done, to solve problems, to get you closer to where you want to be.
So if terrorists believe that killing people is an effective solution to their problems, why is killing terrorists not an effective solution to our problems?