What the OP article left out:
What The Atlantic Left Out About ISIS According To Their Own Expert | ThinkProgress
One of the oft-mentioned criticisms of The Atlantic piece is that it echoed the inaccurate belief that since ISIS’s theology draws upon Islamic texts to justify its horrendous practices, it is an inevitable product of Islam. Haykel didn’t say whether or not he thought Wood’s article says as much, but when ThinkProgress asked him directly whether Islamic texts and theology necessitate the creation of groups like ISIS, he was unequivocal.
“No,” he said. “I think that ISIS is a product of very contingent, contextual, historical factors. There is nothing predetermined in Islam that would lead to ISIS.”