Cars are indeed dangerous Doug. But, as you suggest for drone-owners, one needs to take a test, have licencing and there are rules of the road to be obeyed. Each car is registered and identifiable.
It is illegal to carry a knife in public, but one can zoom a large drone overhead with impunity.

Backwoodsman, you have no idea just how hard I can be. My pupils were absolutely terrified of me I can tell you. And as for my poor little husband, he cowers in fear most of the time.

Heh heh. If only...   :)