All this concern over Collateral Damage confuses me.
We did not give a Tinkers Damn about carpet bombing Cities during WWII and even used two Nuclear Weapons on the Japanese.
The early surrender of the Japanese as a result of the Nuclear Bombs saved Millions of Lives probably.
Perhaps we need to get back to fighting Wars instead of what we do these days as we certainly do not have a very good record from the Tactics and Strategy we employ today.
Comparing the Nazi's and Militant Japanese to the likes of ISIS, Al Qaeda, and Taliban is not completely inappropriate as each were and are subgroups of various populations that brought death, pain, and misery to everyone around them.
Finding the way to attack their infrastructure and funding sources along with their personnel without harming too many innocents in the process is the hard part.
If we are going to defeat ISIS we shall have to wage War on them....War in every essence of the concept.