People would be more reasonable about driving if crashing made them fall really far instead of just injuring them.
I think.
At first, yes. But think about how
utterly fucking insane many things we do today would look to a Dark Ages peon. Hell, driving on the
ground amounts to being propelled around by explosions in a gigantic metal death trap around dozens of other metal death traps for huge distances at high speed. We even admit how crazy dangerous this practice is and how many people die to it, but
we keep doing it out of convenience. We pile into giant metal gliders that do the same thing on a larger and faster scale, except
in the air. That's not even touching space travel.
We make sure our people don't contract some diseases by injecting the corpses of the very thing that
causes said diseases into
infants. We kill other microscopic organisims by ingesting chemicals that are toxic to them but near harmless to us. We bolt rods of metal inside people to keep their bones from re-breaking after cutting them open and re-assembling said bone in the first place. Even with utterly terminal diseases that we have almost no chance of surviving, we still
try, even if that means what amounts to posioning ourselves in an attempt to outlast our own renegade cells. And, might I mention, said time traveler might ask about how we deal with the crippling disease of smallpox. "Smallpox?" we would say. "There is no more Smallpox. We decided we had enough of dealing with it, so we killed it. Everywhere."
I haven't even gotten into our weapons of war. You know, the
least of which involves rapidly accelerating small pieces of metal so fast that the eye cannot see them and are able to utterly rip someone in
half if a large enough one is used? The greatest of which involves either fusing or splitting the very essence of
all that is and creating explosions so large they can scar the Earth itself? The ones that we keep 1-uping each other on to have the best of, knowing all the while that their actual use could spell the death of everyone?
At that point, their head would explode if we tried to explain the Internet.
People can be conditioned to accept anything as normal, flying cars are
nothing.