Nothing to do but make him a house pet.
They know they are apostates and hypocrites and they don't put any value in the idea of Democracy and man's laws. They know that ISIS is the JUST CAUSE. (Islamic-ally speaking)
They are hopeless, by and large.
It is better that we realize that this was a fight we had to try as the champions of Democracy but now that the results are conclusive, it is best to cut our losses and learn as much as we can from the experience and let those lessons positively color our future foreign policy.
But, I predict that will not happen until we finally lose our silly idea of the nature of Islam.