I gotta disagree with people saying that if you are a capable foe or ruthless in the way you fight that terrorists will back down. Look at Chechnya, chechen muslims started some shit and Russia kicked the hell out of them. Russia played just as dirty as they could, took no prisoners, napalmed loads of people, threw whole villages into concentration camps, you name it. But Chechen muslims fought even dirtier, bombed apt complexes, tortured/murdered civilians and POWs.
We didn't do much of anything when we were attacked before and they still hit us, Russia and Israel fight back fairly hard when attacked and they still get hit too. Which leads me to think that muslim extremists don't care whether you are weak or strong, or whether you will fight back or not. They are so into their religion of killing 'infidels' that they just don't give a damn either way and would rather be martyrs. The only real solution other than them to stop being terrorist assholes is large scale WMD retaliation and that would make for one ugly scene.
But on the other hand, Ghadaffi did stfu nicely after we hit him, but i think he's the exception.