A good point - you can't stop every maniac in the World. However, if every school, mall, stadium, company, institution, et al, were to publicize personnel as being armed, it would definitely put a damper on the psychos' plans.
For whatever their reason, be it religious, political, terroritorial, or just plain pissed off or insane, if they know they can't kill at such ease, they just may turn the gun on themselves. Arm All!!! Put a side-arm on every responsible hip and let the chips fall where they may.
agree with all you say. It is insane to think restricting guns helps. Prepare to be very pi**ed at the MSM frothing over "why are guns so easy to get." You will see precious few in government stating the obvious -- that we need to train and arm school personnel.