One would definitely not be enough, one shot from a sniper and the school is again unprotected, same with two or three. Would 10 be enough? Would it be enough for some of the larger schools? Maybe we should have 20 or 30 for the large schools! And people are already complaining about their property taxes, I can just see how they will skyrocket with only one or two armed guards sleeping at school!
With the school employees being armed the criminal would have to kill all of them before they could be sure they got everyone that might be carrying concealed. It may be that periodic mental check of those carrying would have to be implemented. But that would be a future decision to be made.
Actually, the best solution is home schooling, IMO.
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