What would the authorities do to prevent these things, if they existed, from being loaded with explosives and driven into buildings? Even if the idea got off t

What would the authorities do to prevent these things, if they existed, from being loaded with explosives and driven into buildings? Even if the idea got off the ground and anyone (who could afford one) could start flying around, how many terrorist attacks would it take before they were outlawed? Do you think, having taken out the white house, the government would stand behind civilians rights to own and fly them? They'd not only ban them, they're probably restrict private use of drones and planes too.