What you write makes sense, but it can also be considered sophistry.
There are plenty of activities which can be argued as a "privilege" vs a "right." Which this hobby falls into is debatable. The same holds true for other activities which do require registration. If you want to get technical and cite the constitution - note that being in the constitution should make it clear that the activity is an inalienable right. That does NOT mean lack of mention in the same document automatically turns it into a privilege to be controlled and regulated by the government.
I also think the driving analogy is absurd. I have never seen or heard of thousands of drones cramming into a narrow flight path to all head in the same direction at the same time (rush hour on the expressway). Are that many drones crashing into each other at intersections? Even using the horribly flawed driving analogy, you ignore that RC cars are NOT licensed or regulated. Neither are smaller vehicles such as ATVs. Further, on private property registration, insurance and licensing requirements usually disappear. (Let's not get back into the "you don't own the air over your property" claim which has been shown as false.)
Thus the car analogy falls apart. Sure, register/license the truck and family car (DC-110 and Cessna) but not the ATV (Phantom).
Shoot me for writing this, but these small drones are toys. As hobbyists, we are playing and having fun. I'm sure that will tick off the ultra-serious "I'm a real pilot" types here, but it is what it is.
When I was young I had a collection of Tonka trucks. I never deluded myself into believing I was operating a massive crane or dump truck. I knew I was playing with a toy.
Still, if I dropped that heavy, solid steel toy from my grandmother's second floor apartment in Brooklyn, the person on the sidewalk would have been carried away in a hearse. That "toy" could more damage than my P3. Amazingly, no such injury every happened (well, there was an incident with GI Joe but that was mission related).
Should a kid need a license and registration to operate that Tonka truck? "Playing with toys" is, after all, a privilege and not a "right."
You feel a "drone license" is the answer. That's a valid opinion. I and others disagree and rely more on personal responsibility than government oversight to coexist with others in society.
I feel I have a "right" to be left the heck alone by the government and not bothered unless I am doing something wrong. That concept is one this country was founded on. Unfortunately, as government has become bigger and more intrusive, many people have been taught to accept the opposite.
And what's with all the name-calling? "Knucklehead lowest common denominator" is a fabrication of the media. Just go on You Tube and you can see plenty of people doing dumb things, many which are considerable more dangerous than anything done with a quad copter. For whatever reason, there is no media outcry about those (hopefully) isolated incidents. Instead, they are celebrated on "Tosh."