When I heard how many kids were dead, I figured it had to be the AR-15 that the killer used.  It's a horrible thing to say, but with my AR-15, I could easily kill 27 at close range with 3 30 round clips.  The kid had been at the shooting range a lot, and was probably a better shot than I am.  This deal was horrible enough on it's own that it doesn't need to be a consipiracy.