Thracian
I don't want to propose to forbid multicopters, but the buyers at least have to learn a little bit about the rules that apply, the danger their toys may become for others and the consequences that may occur if something happens.
My point entirely with reference to guns.
Glen
I fly a decent sized plane for a living
Come and join us down at low level to discover the birds (who do indeed try to avoid us) and the drones/multicopters/whatever who actively seek to be in the same airspace as us because of what's going on below e.g. fire, accident etc.
Crab
the problem with the argument is that the punishment is always retrospective.
While that's true the key lies in KNOWING that there will be retrospective punishment, which most do not as Thracian has said.
MarcK - If you want to talk about knives then you entirely make my case. I'm not an expert on this but isn't it still illegal to sell, carry or use a flick knife? Why? ... because on balance that particular branch of knives is more likely than not to be used in a way that we (the rest of us) don't want it to be used ... because it's dangerous.