the truth is, people have a lot of experience with other people. we can usually predict behavior of other drivers on the road, and can even predict pathological behavior or know how to handle it. that is a major point. when machines and software fail, they can fail in big, unpredictable ways. humans fail in fairly predictable ways. none of us have this experience with neural networks or machines.
i barely trust my computer to work on a daily basis, much less a vehicle.
and lastly, when a human is driving, fault is usually clearly and easily assignable. how fault is assigned in the case of machines driving is not clear at all.
of course safety is important. and i agree that verifying driving ability is well behind where it should be. elderly and inexperienced and inattentive and just plain bad drivers are major problems on the roads.
and fault certainly does matter. aside from legal responsibility, we are emotional beings. there is a difference between getting hit by a drunk driver versus a true accident. that affects people in real ways. as a motorcycle driver, i will be terrified of these automated vehicles. i am already terrified of human drivers, but i can often predict their idiocracy.
no one wants to be killed by a machine, especially one built by wide-eyed engineers.