I've seen gun nuts claim that this wasn't on national headlines because it could be seen as pro-gun... despite the fact that this is ideal circumstances for someone to stop a shooting in this manner. Most cases, things happen far too quickly and the shooter is far too prepared for anyone to react in such a way and generally people reacting in this way simply leads to more chaos. No, I'm going to have to agree with those saying it didn't make national headlines because no one was killed because, speaking as a journalism student, the American news media is interested almost entirely in ratings, not informing the people. Most news stations are going to see a failed attempt to do a copycat shooting and think "Well, we can't get any extra ratings off this, keep it local," while their reaction to a successful shooting is to tap into people's emotions and fears.