he had comparatively anemic 9mm pistol on him, nothing more.
The DUmmie was doing great until this statement. 9mm rounds are quite lethal, hardly "anemic." In fact, the highest fatality school shooting in US history, Virginia Tech, was committed by a shooter using a Glock 9mm pistol and a Ruger 22 pistol.
Not to mention the fact that pistols are used to commit far more homicides than rifles.
IMO, the reason the ARs are used in so many school shootings is that the MSM always fixates on them and pretty much advertises ARs to nut jobs as the weapon of choice. If ARs are banned then shooters will just use another type of firearm. And if guns are banned altogether then nut jobs will just find another method to kill people.