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Also, I'm not sure the fact that the "who had never fired their weapons on duty" deserves such highlighting. Is your argument that they should not have been on duty until they had fired their weapons while on duty? Logically all cops would have never fired their weapons on duty until they do.
I think the larger point is that if it's even difficult for police officers, who have much more stringent training and experience with stressful situations than the general public, to fire on a suspect without endangering those around them, why would you think members of the general public would be effective at stopping criminals without even larger collateral damage?
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