But we don't live by a purely utilitarian principle of ethics. "I'm sorry Mrs Jones, I know your son had an expectation of crossing that pedestrian crossing in

But we don't live by a purely utilitarian principle of ethics. "I'm sorry Mrs Jones, I know your son had an expectation of crossing that pedestrian crossing in full daylight in a residential area without being mown down by a machine learning algorithm gone awry, but please rest assured that overall fewer people are dying as a result of humans not making the common set of different mistakes they used to make". All sorts of other factors are relevant to the ethics: who took the decision to drive; who's benefiting from the drive happening; is there a reasonable expectation of safety.