If they outlawed drones for that, well, what if someone put a semi-auto set of rifles in a car? 4x front turrets, 2x each side, 4x rear. Attach controls to auto-fire the weapon (repeated trigger pull or modify the firing mechanism to do full auto) and you have a nice terror weapon. You can stuff a lot of rounds into a car if you create a custom clip design. How many casualties on the freeway before you got caught? Or in a parking lot or worse, one of those strip malls?
Therefore, let us ban automobiles!! 
Believe it or not, but that idea's been around since the first James Bond movies, if not earlier. Therefore, it's not fashionable or very realistic to the paranoid, because it's widely known that you'll only ever see that happening in the movies or on TV.
Drones, on the other hand, are not at all common to everybody. Do you see a drone in everybody's driveway? No. Do you see a drone at every airport? No, (or not yet at least). Therefore, drone's currently boast the unknown factor that is very famous for instilling paranoia and fear.
Another thing against drones? They're machines. Even though people know that total machine takeover only happens in the movies, it's still a serious threat and is increasingly gnawing at the minds of everybody who fathoms their potential.
