All parties have a responsibility when travelling in and around public roads.
Using your logic, if I were to try to cross the railway line and got hit by a train, the conductor has a "responsibility to spot and react in situations like this as it is the dangerous machinery that can cause injury and death." While I agree with the conductor's share of the responsibility, I'd still say that I'm to blame for not crossing the railway lines more carefully.
Railway lines are physically barring people from crossing them. Walking on rail tracks is actually forbidden. When a railway crosses a road there are physical barriers and audiovisual signals to prevent people from crossing when a train is near.
Roads in cities are shared spaces. Pedestrians have to obey traffic laws but as a car driver you are taught to anticipate incorrect behavior from pedestrians, especially to accommodate children who might not know any better or the elderly who might be absent-minded (e.g. start crossing a street then turn back because they worry they might not make it).
It's driver education 101. If there's a parked line of cars and there are apartment buildings and maybe you even spotted children playing, anticipate that a kid might dart in front of you for some stupid reason because they don't understand the risk. So slow down and anticipate having to come to a full stop.
This was a high visibility situation on an open road with no other traffic. The pedestrian violated traffic laws by crossing the road outside a marked crossing but that happens all the time. A human driver would have anticipated the possibility of this happening when they spotted the person standing beside the road in the distance. They would have decelerated when they saw the person start moving onto the road and they would have made a full brake when it became clear the pedestrian was going to walk straight onto the road with no regard for their own safety.
The automated car showed no signs of having adjusted to the situation whatsoever. Sure, the pedestrian was stupid and got herself killed, but the car was driving recklessly and bears the full responsibility.
EDIT: to be clear, your example is equivalent of a person climbing onto a highway/motorway, not of a pedestrian crossing a street.
While I get your point, I do think there's an important distinction: train lines are rare, usually far away from where people live, walk, bicycle, etc. Roads, on the other hand, occupy a significant portion of public land in our cities. It's not great that it's effectively a death sentence to be less-than-focused while walking home.
You know the old saying "with great power comes great responsibility". The onus for being responsible is not on the pedestrian. It's on the person (or CPU) operating the multi-ton machine at speeds that can kill.
Using your logic, if I were to try to cross the railway line and got hit by a train, the conductor has a "responsibility to spot and react in situations like this as it is the dangerous machinery that can cause injury and death." While I agree with the conductor's share of the responsibility, I'd still say that I'm to blame for not crossing the railway lines more carefully.