I see your point. It would make more sense if guns were actually 'illegal' rather than 'controlled.' People with cars kill people. We require folks who want to drive to meet some requirements. Cars are not illegal, but not everyone is allowed to drive them. Babies, the blind, drunk people, my girlfriend....
I understand your point. It's certainly not fair, but how do we do this?
First off, they aren't allowed to drive on anything but private property.
Next, you are comparing owning a firearm to driving a car, which is not the same. Apples to apples would be owning a firearm and owning a car, or firing a firearm and driving a car. It is hard to compare.