[nknighthb]

It's not so simple. A worst-case scenario for a flying car might be nose-down terminal velocity into a crowded building. Or even faster, if the driver were deliberately accelerating into the building, trying to use the car as a kinetic weapon.

Scheduled commercial airline flights are quite safe, which makes people think "flying is safe", but general aviation, which lacks many of the strong controls that scheduled airlines have, is much worse[1]. I would expect flying cars under manual control of typical drivers over a crowded city to be much, much worse still.

[1] http://www.ntsb.gov/news/2012/120427.html