ISIS has done, and is currently doing many horrible things. How could burning people alive not be considered a war crime? I think it is very important they are charged for these acts, and serve time and/or are punished for these acts. Burning people alive is one of the most horrible things you could do to a person, so they deserve to be punished.
Yes, ISIS members have committed war crimes and should be charged accordingly. There is no excuse for committing these crimes against humanity, crimes that are extremely gruesome in nature, and ones that target women who are rejecting sex slavery, a horror that is a violation of human rights in and of itself. No cultural, religious, or political guidelines can rightfully justify the acts of these individuals.
ISIS members should be charged with war crimes, but it would take more than a war crimes warrant to bring these fighters to justice. ISIS simply doesn't listen to reason as members of this group desperately hide behind the cloak of a religious jihad to promote atrocities. Western allies may need to take military action to take out ISIS, and war crimes may elevate that action to a more concerted effort.
ISIS continues to flout decent human behavior, and should be charged with war crimes for their recent burning of 19 Kurdish women. These women did nothing wrong, except to bravely reject becoming sex slaves. This is just one example in a string of abhorrent behavior that should be strongly punished.