Guns are designed for killing. Military guns are meant to kill the enemy. Police guns are meant to kill someone attacking a police officer, or a civilian. Self defense guns are meant to kill someone potentially attacking the gun holder. Hunting guns are meant to kill game.
You may argue that target shooting guns are the exception. The reason for target shooting is to train to kill, so not even there. Besides, most target shooting guns are just regular guns that are used for target shooting. I have never heard a sniper say, "I can't shoot someone with a target shooting gun."
Cars can kill also, but their main purpose is to transport things. Car designers will try to make cars less lethal. Gun designers want guns to be more lethal.