In an article by Professor Gabriel Said Reynolds, he says…
What motivates them is neither insanity nor political radicalism. They are driven by a powerful religious impulse — and a craving for a bloody, apocalyptic showdown with the West….
ISIS will wage war, and wage it constantly, in the hope of luring the United States into a massive invasion, in the hope of provoking a final battle that will usher in the end of the world….
This does not mean that the United States should rule out ground forces unconditionally. There may come a time, and it may come soon, when ISIS’ brutality will reach the level of genocide, and it would be a crime not to intervene.
Nevertheless, any decision to intervene should be taken with the knowledge that we will be giving ISIS the very battle for which they are yearning.
Another article worth reading is by Peggy Noonan, An Administration Adrift on Denial .
Enlightening: What ISIS Really Wants