The role of Islam in the current conflicts

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ISIS follows the qu'ran in several ways other Muslims in the world don't. The Qu'ran sanctions and gives instructions on the treatment of slaves, which ISIS follows as they follow the example of Muhammad in enslaving people. Other muslims puss out and give into the social pressure of the outside world in not having slaves. That's just one of dozens of examples of how ISIS is more faithful to the Qu'ran and Muhammad.

There is no verses in the Quran that allows Muslims to take slaves.
Rather, ISIS is only following the Sunni understanding of slavery.

That's being very nitpicky, according to wikipedia the Qu'ran mentions slavery 29 times, mostly rules about the legal status of slaves. Also the little fact that Muhammad himself took slaves during his conquests. So either he was morally wrong to do so, or taking slaves during conquests is permitted in Islam.