Would you support the use of nuclear weapons on our planet to have a chance of eliminating ISIL?
The whole reason we are in the Middle East is for oil. We would not ever want all that to suddenly become radioactive. If it did it would send oil prices skyrocketing. That's not good for the US or the global economy.
I'd rather carpet bomb them. Nuking can effect other countries
The biggest problem is that someone's probably going to have to move to the old battlefields, so we somehow have to keep the land at least a little bit arable for the sake of the future.