It doesnt, they are monstrous vermin. Who should not have the kind of power to destroy as they do now, if it wasnt for the actions of the powers to be in region (US and its coalition, russians, saudi's, Iran's shia sphere, bizzarely flip flopping Turkey). Wether its how the oppressively destructive and shortsighted foreign policy makes easy for these extremists to recruit, or the fact they were trained and funded by them directly for their short term power play of the time. Its kind of insane btw, that to fight Isis, right now the US is yet again supporting/funding Al Qaida through Nusra front. Things never change...