The privilege granted by registration can be linked to other things. So when Mr. Dumbass decides to buy more beer instead of paying for insurance, and subsequently rear ends your car, you are screwed as a motorist. The requirement for registration and insurance tied to a drivers license makes the driving environment work for the vast majority of people.

The same thing applies to drones. When some jackass decides to peep into my daughter's window every day, why should that person be able to act with anonymously and with impunity?