This is what's going to happen. If you've ever seen a machine learning algorithm in action, this isn't surprising at all. Basically, they'll behave as expected some well known percentage of the time. But when they don't, the result will not be just a slight deviation from the normal algorithm, but a very unexpected one. So we will have overall a much smaller number of deaths caused by self driving cars, but ones that…
Are you working on the next season of Black Mirror?
In all seriousness, my fear (and maybe not fear, maybe it's happy expectation in light of the nightmare scenarios) is that if a couple of the "weird and terrifying" accidents happen, the gov't would shut down self-driving car usage immediately.