"The only thing that will stop a bad guy with a gun is a good guy with a gun." -- National Rifle Association executive vice president Wayne LaPierre
You're missing the point. The goal is to keep the gun away from the bad guy in the first place!! Hello?!!? And what if you put someone in a school who claims to be a good guy but is actually bad? Then you have an adult with a gun in close proximity to children on a daily basis. Wasn't that the whole problem to begin with?