"Terrorism is evil and must be destroyed. "

Granted. However, terrorism is not a snake in the grass or an elephant or a human being that can be eradicated with guns. Terrorism is a means to terrorize for whatever purpose. As such, it's not something you can kill. It's an idea, a mindset, a cloud in the sky, nothing concrete that you can grasp.

Look at the people who create and spread computer viruses for an example of non-lethal terrorism- you can run along behind the viruses and kill each one as they become evident but you can't kill the person that's going to do it beforehand or even so much as stop the person before s/he does sets it free on the world.

The worst thing about hunting down and killing those who terrorize in the name of country, religion or family is that in the act of killing one terrorist you are creating another. And there will always be another generation...

Is there anything that does work? I dunno. Understanding grievances would be a start.