The only way to defeat the ISIL is to kill every one of them by whatever means we have at our disposal. Find a large concentration of them and carpet bomb it. Stop playing nice and following “rules of war.”
Here’s my dream: Scientists find and manufacture a powder, that when crop-dusted on people will put them to sleep for 24 hours minimum (without side effects). Allows soldiers to go in and grab the monsters. Put the monsters on a cargo plane, remove their clothing, coat them in pig lard and either drop them from 10,000 ft into the ocean (fish food) or put them in the middle of the desert where they will turn into cripsy bacon...