Please tell us why you blame the gun since it is really no more efficient at killing people, or any deadlier than any ordinary semi-automatic deer rifle. It just looks different.
I know several guys who predator hunt with AR's because they are lightweight to carry and cool looking (to them) but other than that they are only a machine that shoots a projectile.
And please be explicit as I am truly trying to understand. But there is no doubt you've been hoodwinked by the liberal media. Did I mention that many people think they look cool?
A shotgun is much more efficient at killing people at close range (like in that school). Heck, you could kill several people in one shot with a shotgun.
But they just don't look cool, or look like an "assault" weapon. Named by Liberals to install fear among those that don't know better.