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If the officer didnt intend to shoot the guy then his incompetence resulted in the gun going off. Yep, sack the fucker. He/she shouldnt be allowed to be armed.

If it was being handled then it hardly went off on its own.

Were they being used/handled by a person at the time or were they just sitting there loaded with nobody around them when they went off?

Cars dont start themselves up and drive away just as guns dont fire by themselves. Both require an outside influence to work. Sack the fucker.