One thing that does seem to emerge is that the kind of people who get caught up in this stuff - the footsoldiers, if you will - aren't really particularly religiously motivated, or especially idealistic (though they may claim those as after-the-fact justifications for what they are doing), but lost. For whatever reason, they have lost, or never had, a "place" in society. Along comes something like ISIS, al Quaeda, or an intifada, and all of a sudden, there's a cause they can join, something to give their life meaning, even if it means a very much shorter life.