We do hold non-self-driving car makers responsible for bad manufacturing. But in accidents not due to manufacturing we primarily hold the human drivers responsible. I agree with you overall, but the problem is that people seem overeager to hold no one responsible at all, sometimes based solely on a blind faith that self-driving cars will be safer than humans soon, and that the deaths along the way are just the price we will have to pay—as if there is no other option between no self driving cars at all, and the “move fast and break things” attitude that here resulted in a person’s death.
The thing to remember is that limiting self-driving cars is not safe either. Human-driven cars kill thousands of people every day; a policy that saved this person's life but set back self-driving car development by even (say) a month might well do more harm than good.
