Teachers, and people in general, are not guaranteed to be competent, reasonable, nor fair in judgement when placed in dangerous situations. Most armed teachers would likely forget to use their weapon in a violent situation, while at least a small few would abuse their armament to threaten students.
Even in cases where a teacher would use their, or their assigned, firearm against a genuine threat, there is no guarantee they would hit their target. Honing in accuracy and proficiency with a firearm takes time, and is not something a brief course could ever properly produce.
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