They “left” when Imam Obama proclaimed he rid the world of terrorism and the Global War on Terror is over (forbade the Pentagon to use the term when he was elected).
All the rest of the other freak instances of murders of more than one person are “workplace disasters”, Sporting event mishaps (Boston) and the like.
Meanwhile our nation’s arrayed forces have been engaged in massive covert operations to catch those three old coots up in North Georgia in some “militia terrorist” act other than talking out of their old asses.
You nailed it.