So what can we glean from the early reports:
1. The weapon was a shotgun, which has been pretty much under the banners' radar while they focus on "evil" AR-15s and clones. Most likely we can now expect, rather than an acknowledgement that semi-auto rifles aren't inherently evil, a new push to add shotguns to the list of "evil" firearms.
2. A custodian saw the kid enter the school with a shotgun slung over his shoulder. No, I'm not faulting the custodian for putting his life at risk and trying to tackle the kid. But ... at least around my corner of the world. schools have been tripping over their purse strings in a lemming-like rush to install precisely the kind of door buzzer system that did NOT keep the shooter out at Sandy Hook a year ago. In this case, even though this school is just a few miles from Columbine H.S., apparently a kid was able to just WALK IN with a loaded shotgun.
So we didn't learn anything from Columbine, and we didn't learn anything from Sandy Hook. The prevailing attitude, despite paying lip service to teacher "training," is that "It won't happen here."