The public is stupid.
I don't think most people truly realize the dangers of having millions of slow-response-time, error-prone, likely distracted, potentially intoxicated, potentially angry or upset, potentially aroused, horrible at multitasking human creatures sticking their foot on a pedal to make a several ton weapon rocket forward at 60-70 miles per hour, all just feet or even inches away from a bunch of other idiots in weapons doing the same thing, with everybody HOPING that we all stay inside of the little white lines of paint that we call lanes.
Anybody even a little open-minded and even a little knowledgable about how dangerous automobiles are when humans are at the wheel should be able to put their fears of not being in total control behind them and should be very excited for a self-driving future.