[Radar]

The knife (and in fact all sharp blades) were made for both killing (hunting) and for food preparation. The first knives were made from sharp rocks. Only later were blades used for other things like cutting down trees. This is where the chainsaw came from.

The baseball bat is a modern version of the club which also goes back to caveman days and was also used for the killing of animals, and other cavemen.

Cars were meant for transportation, but like the knife, and the bat, and the gun, it can be made into a weapon. There is no inanimate object that is inherently made for killing. Nuclear weapons weren't even made for killing. They were made for defending, and for letting others know they shouldn't attack us. Nuclear weapons, guns, and all weapons have a main purpose and that purpose is to PREVENT killing by giving us a means to defend ourselves and hopefully scare off would-be attackers.