A friend of mine pointed out a good effect of self driving cars, if we ever get them. They could eliminate the angry, aggressive driver. Even eliminate road rage. Idiots, behind the wheel would have to just relax and let the car drive. They could read a book, use their cellphone or whatever. It would be more like riding in an elevator. The elevator does the driving for us and there isn't much the passenger can do to make it go any faster, or slower.
I've been in elevators, where folks have joked when they pushed the button for a floor to get off at, "I'll crash the elevator."
The friend, that was discussing this concept, is into cars, himself. He likes fixing them and so forth. I think he sees the advent of self driving cars as a step forward.