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It is not a ludicrous idea to allow it. But it is ludicrous to think that it will have any significant effect on reducing school violence. There would perhaps be one death every few years as a result of allowing teachers to have guns in school, and perhaps once in a dozen years or so a mass killing might be prevented. On balance, it would have little if any effect.
The issue is similar to allowing pilots to carry weapons. A hijacking might be foiled perhaps once in twenty years from the policy. On the other hand, there might be some bizarre incident where someone is killed as a result. On balance, it is not an effective way to fight hijacking. But it doesn’t hurt. Why not let pilots carry guns if they want?
