Most stuff that gets posted here is just horrible and bleak shit, so here's some catastrophically absurd libertarian brainworms instead.
And this is why I say we have a duty to make the cheap ones and fly them anyway. The laws which make this the case are equivalent to those which made people walk in front of early cars waving flags. Between our current fear of any risk, and the vested interests of the powers that be in existing transportation, the flying car will never happen until someone builds one anyway, and allows everyone else to follow in there footsteps.
I'm certain that I understand the Bayesian False Confidence theorem correctly, and it says that the more you increase your degree of freedom (axes), the lower the risk of collision, so jot that down.