I'm not using it as a benchmark at all.
I'm using a high profile example to point out clear issues with how we handle human driver responsibility. If your negligence directly results in you killing someone, you should lose your license to drive.
If we someday reach the point where autonomous driving systems are actually 10x safer than human drivers and those systems still have issues with hitting emergency vehicles, we should absolutely hold those companies responsible for those accidents.
My point is that not holding those companies responsible would be less insane than our current practice of letting clearly negligent drivers continue to drive with minimal consequences after they kill someone.
So instead of being outraged about this hypothetical future, why not be outraged about the insane lack of consequences that drivers face currently?