The attacks on Paris demonstrate that ISIS and its local sympathizers are capable of hitting civilian targets almost at will. Unlike al-Qaeda, ISIS is partly decentralized, and far more difficult for police and intelligence to infiltrate or monitor. On the other hand, fanatical zealots tend to overreach, just as Hitler disastrously overreached when he invaded Soviet Russia. In its recent actions, ISIS has over-reached. In the past few weeks, ISIS or its sympathizers blew up a Russian civilian airliner and suicide-bombed a neighborhood in Beirut controlled by Hezbollah, in addition to its barbaric attacks in Paris. This all may be consistent with ISIS's warped world view--but it is strategic insanity. You can't attack everybody without bringing everybody into a coalition against you.