One of the problems is that the public is being sold on the merits of the tech without being provided with a good understanding of the risks involved. So the expectations are too high. If the developers want to test these vehicles out in the real world, the public needs to understand that not only does shit happen, but in this case, shit will happen and lots of it. But the future boon to society is way beyond what most people realize. That boon could start in a few years or in 100 years and it's up to us to decide what we want. Of course it becomes harder when it's your kid who dies.