Guns are for killing. Nothing else. Unlike cars, trains, planes, knives, axes and lawnmowers.
No. Guns are for projecting lead, usually copper-jacketed lead, at a point in the distance.
That poor defenseless watermelon. Murdered in it's prime.
Killing another human being is, statistically, the least significant use guns are put to.
There are many guns (possibly even most) which have never killed a human being. Almost all of the guns which have are property (or were at the time) of a government. There are, additionally, guns which, despite the relatively high number of times they have been used, have never killed anything, except possibly watermelons.
So?
So your argument is invalid.
In what way?
You said that guns are for killing, and have no other purpose. I showed that guns, first off, do not have that purpose at all, unless given to them by the user (not the manufacturer). To quote William Gibson (from off his twitter feed, just now, @GreatDismal), A gun is like a very long, very fast temporary finger, but of very limited utility: instantly pokes a hole in a distant object.
That's all it does. Secondly, I showed that that distant object is almost never a person. Usually it's a piece of paper, or a fruit, or a milk jug full of water. Once in a while it's an animal.
So guns a) have a purpose which is not killing: Poke a hole in something far away, and b) are rarely used to poke holes in people, and c) almost never are they used by civilians to poke holes in people.