no matter how one rates the level of the threat isis poses, the group has changed the nature of terror. the leaders of isis have recognized that above all, they are a messaging machine. which in turn becomes a recruitment machine. their gruesome videos would seem a repulsive turnoff, and are to most people, but they work on the web. the shock and awe they produce makes them go viral. and thus are seen by tens of millions. that ensures that these videos attract those utterly alienated young men, a few thousand among the world's 1.6 billion muslims who seek revenge, glory and gore, and as long as those young muslim men scattered across the globe, are attracted to isis and stream to its cause, the group presents the world with a danger that is impossible to fully