“The only way to stop a bad guy with a gun is with a good guy with a gun.” The official line from the National Rifle Association after the shooting of Sandy Hook Elementary, this has since become standard rhetoric for pro-gun advocates. Yesterday's tragedy in Las Vegas highlights the grotesque lie of this claim. A simple question to ask any of your pro-gun acquaintances: How could ‘a good guy with a gun’ have possibly done anything to stop a man shooting down into a crowd from the 32nd floor of