You left out murders using handguns, which are the most common weapons used in homicides. Funny that you'd do that. Wouldn't be because your argument doesn't hold water, would it? Knives, hammers, cars, airplanes, concrete blocks and countless other objects can be (and are) used in murders, but these objects have other uses that justify their existence. Besides, when it's feasible, they're modified or restricted in order to reduce their use in crimes. Only guns, which are designed specifically to kill, seem to be exempt. That's nuts.