Ahh, if you think this is a new problem, you're too young to remember the fun of calling a cab by pay phone to some obscure address, then alternating between going inside and calling the dispatcher and then running out to the street to try to flag down the cab.

At least with a driverless car I can pinpoint my location on a map when I call it.

Person winds up being in an unsafe environment and needs immediate assistance.

Existing car-share (and cab) drivers are also willing to drop you off in an unsafe environment if that's where you told him you want to go. While sometimes they'll stick around to make sure you make it to your door (if you're female), that's by no means guaranteed.