Just to address your first point, data is not actually too beneficial when it comes to general public policy making. Many people make decisions based on emotio

Just to address your first point, data is not actually too beneficial when it comes to general public policy making. Many people make decisions based on emotion rather than data. For example, some people have a tremendous fear of flying. Yet flying commercially is one of the safest modes of travel: a person is far more likely to be injured on the way to the airport than to be injured in a commercial aviation accident in this country. Likewise, the first time one of these cars misreads a signal or marking and plows into a farmer's market, the panic will be significantly greater than when an impaired driver causes the same damage; even if we have data to show that for each self-driving car injury there are 100 human-driven car injuries, it will be tough to override the "I don't have control of it, I don't understand it, I'm scared of it" emotional gut response of people.