I think the citizens of any given murdering-moslem town would be all over their would-be terrorists, to dial it back.
If done at all, it would probably only need to happen once.
A glass parking lot somewhere in a zero population zone, along with a sternly worded letter, would probably get the point across just as well
The first was December 2001 at Tora Bora. As soon as OBL's presence was identified there, we should have taken 2000 feet off the mountain and killed him and his entourage. Pour encourager les autres.
The second was at Fallujah, after the murder of the four contractors. Evacuate the city through sand berms with checkpoints. Arrest/detain bad guys. Then vaporize the place. Pour encourager les autres.