As someone who has spent decades studying the conflicts in the Middle East, there is little that can shock me, but some of the videos now coming out of Syria have left me sickened. In one, footage shows Syrian jihadists executing Kurdish civilians, scalping young women, and piling the bodies of victims whose throats had been slit. These were not battlefield engagements. They were acts of ideological violence intended to terrorize minorities into submission.

My colleague Jonathan Spyer wrote recently in the Middle East Forum: “I have seen the footage – desecrated corpses, abused female prisoners, and attempted beheadings of Kurdish women. The jihadists themselves posted it online, proud of their crimes.”

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