But terrorism experts caution that because the Islamic State seems to have broad appeal to the mentally unbalanced, the displaced and others on the fringes of society, there are limits to how much any military campaign in Syria and Iraq can reduce violence carried out in other countries on the group’s behalf.
William McCants, a scholar at the Brookings Institution and the author of “The ISIS Apocalypse,” said there was a large cadre of “men and women who have no organizational ties to ISIS but murder in its name.” These irreligious criminals and social misfits, whom he described as “ISIS-ish,” are “rebels looking for a cause,” he said.
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