What ISIS Really Wants
The Islamic State is no mere collection of psychopaths. It is a religious group with carefully considered beliefs, among them that it is a key agent of the coming apocalypse. Here’s what that means for its strategy—and for how to stop it.
By Graeme Wood, March 2015
I recommend this article. It’s long, really long, but well worth the read. But it’s been the best description of what is going on with ISIS and other radical Islamic groups I have encountered to date.