Personally, I think we need to stop identifying this as a problem with a group of people, and rather as a problem with an especially dangerous ideology. Once you start filming yourself beheading prisoners, whom you admit have taken no hostile action, you have crossed into a condition whereby your opponents can never deal with you in a non-lethal way. I felt the same thing about the Serb militia members who were taking potshots at Bosnian civilians from the hills around Sarajevo. There are some rules you just don't cross, at least if you expect not to be killed eventually.
I know someone will say the west is guilty of the same thing due to collateral damage during bomb strikes and so forth, but there is a difference in specific intent to harm civilians. Pretty hard to avoid collateral deaths when the opposing force deliberately fires upon you from Mosques. When I was in Afghanistan, I wore the uniform at all times, lest I be captured. If you're found on the battlefield not in uniform, the Geneva Conventions say you deserve no rights of protection at all. Anyone ever seen any Al Qaeda/ISIS fighters wearing a uniform? Following any of the rules of armed conflict whatsoever?
