GREGORY BARISON’S letter suggesting that a responsible civilian gunner might have halted the slaughter in Norway is exactly, totally the wrong answer (“Those bent on mayhem count on being only one armed,’’ July 28). Norwegian police are not normally armed; they should be to protect the public. Norwegian civilians are not armed and should not be. American civilians should not be armed, either. The credo we should seek to adopt is “arm the police, not the public’’; the irresponsible armed public is where the thousands of annual gun deaths in the US come from. Let’s grow up.