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[krispos42]

75. The people that want to arm teachers have a terrible idea

Mainly because the odds of an armed teacher being in a position to stop a random spree shooter are extremely remote. Teachers going into a lockdown aren't going to abandon their class and go roving around the school looking for an armed insurgent. Once a lockdown happens, then unless the shooter bursts into the classroom of the insurgent, it's not going to do a damn thing.

However, the odds of there being regular incidents of accidental discharges, missing/stolen guns, or interpersonal relationships going to a violent end are much, much higher.

A school that was in some kind of conflict zone, then you can argue that armed teachers (as a supplement to armed guards, hopefully) was a necessary counter to roving bands of kidnappers, rapists, and thieves.

Since none of our 135,000 schools are in a conflict zone, then the odds of regular accidents and thefts far outweighs the benefits of armed security.