You've heard so much and seen so much about isis, it's easy to get anxious, it's trying to scare you and confuse you. just recently the group took credit for a planned attack in garland, texas. but so far, it appears that two perpetrators were inspired by isis not actually a part of it. with that caveat let me offer a few tentative thoughts about the group. isis is clearly about religion, about its version of radical islam. but it is also about power. there's increasing evidence that the military backbone of isis is made up not by a group of islamic zealots, but high ranking officers from sadd...