> The problem is that technological advancement far outpaces our ability to reason or control its usage effectively. Regulation lags misuse and eventually something (drones, nanobots, whatever) is going to lead to a massive and irreversible calamity before we change our starry-eyed rush to embrace the "new".

To paraphrase Lord Of The Rings, those who have no drones can still die by them. As long as drones are being made in China or Iran or anywhere in the world, a terrorist/non-state actor/motivated assassin/special ops unit can get them and use them against you. Banning them in the US may slow this down, slightly, but it won't prevent it.