What could possibly go wrong?:
We don’t want to send our kids to school to be shot by a madman. But we don’t want to send them to school to be accidentally shot by the janitor, either. Guns on campus should be in the hands of law enforcement personnel, period.
Yeah, but law enforcement personnel cost money. Why spend money if you don't have to? Besides, law enforcement personnel are part of the big government conspiracy to take away our freedoms. Much better to rely on somebody who hasn't been indoctrinated by the state to protect our children.