Flying cars is a really bad example... We have them, they are called airplanes and airplanes are regulated to hell and back twice. We debate the risk around airplanes when making regulations all the time! The 'flying cars' you're talking about are just a different form of airplane and they don't exist because we don't want to give most people their own cruise missile.

So, please, come up with a better analogy because the one you used failed so badly it negated the point you were attempting to make.