Okay, the gun vs plane/car thing is ridiculous, so I'll clear that up now.
A gun is a tool. A rock, is a tool. Airplanes and Cars, are tools too.
Tools cannot do anything by themselves, neither can any other object which is inanimate.
However, the reason they are tools is because they have been constructed with an intent purpose in mind.
Take the rock, for example.
A rock is just a stone, but if sharpened and cut, can be turned into an arrow head.
Both the Rock and the arrow head are made of stone, so why was the arrow head made?
Because the purpose of the arrow head is to kill, and that is the reason it was invented; there was a need to increase the odds of killing, whether to hunt or defend, and so the stone became specialized. True, you can kill with a stone, but it is more effective as a hammer than as a killing item for, say, hunting. The arrowhead, on the other hand, is more effective for hunting than as a hammer. It was made with that purpose.
Just because something is made with a purpose however, does not mean it can't have other uses; that is why humans have survived; it is called creativity. That arrowhead could be attached to a stick and turned into a spear, and the spears could be used to make protective fences, and so on. However, the arrowhead will always be better for what it was made for - hunting - just like the spear will always be better at piercing than a protective fence (hence the reason barbed wire was invented).
Same with guns, cars, and airplanes.
Yes, and airplane can kill, but look at the practicality of it; once used as a "weapon", the user dies, not to mention that it costs millions to make, and finally that a missile, which is designed for the purpose of destroying, would be more effective at that task anyways. That is why airplanes are not commonly used to kill people.
Cars: The odds of killing many people with one car are low, and again, once used as a "weapon", can kill the user, and are also costly.
Guns: If you use it to kill, it will most likely do that. The user is left alive, and can keep killing, and its much more cost effective and efficient than many, many other items.
Hence, the purpose of a gun is to kill.
The purpose of airplanes and cars are to transport.
You equating that all airplanes/cars are weapons simply because they can kill is the same as me equating that all guns are hammers simply because I can use one to hammer in a nail in my bedroom.
Guns are killing tools, and tools were created to be used.
Its true you may not have the intention kill someone with a gun, but say you had your gun, and someone comes at you with a knife screaming "Ima KILL YOU!", would you;
A) Shoot him.
B) Get in a car and attempt to run him over on grass.
C) Get in an airplane (yes, you have an airplane in this scenario), warm up the engines, and crash into him?
