But.. they did have that? What a bizarre argument.

And yes, if you make software that drives the car, release it into public traffic, and then your software runs someone over that would be plainly visible to a reasonable human driver (the misleading dashcam footage you release to make it seem way too dark [to a shitty dashcam sensor] notwithstanding) - you should absolutely bear responsibility! How is that even a question? You did that! Not whoever you put there as a "safety driver". We can adjudicate their responsibility separately, but it's certainly not 100%.