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It is simply beyond reason to assume that a properly trained school teacher, somebody we put in charge of our children for the greater part of their day, would be less responsible or capable of handling that duty in case of emergency.
The keywords there are "properly trained."
To deal with this kind of threat will take a lot more training than is typically available to new gun owners, which is basically how to safely handle the weapon and to put three out of six hits on a paper target at twenty feet. The fact is it will take a trained
gunfighter to properly and adequately confront a well-armed, suicidal assassin at close range. And this requires many, many hours of intensive, exhausively repetitive training and, most importantly, it calls for a certain mentality which is not typical of the vast majority of teachers.
The mindset needed to produce an effective response to a well-armed, suicidal, mass killer calls for the kind of intensive conditioning which enables
reflexive responses, thus bypassing the potential for
freezing under threat and eliminating the need to think about what to do. This reflexive capability not only requires extensive training but frequent practice (stimulus) sessions.
So the idea of arming school teachers is essentially naive and uninformed.