I've said before that Waymo is already vastly, incredibly safer than some of my older relatives who refuse to give up their keys. Ever been around The Villages in Florida and seen a man leaning forward behind the wheel to squint at what they're driving toward, with their wife shouting at them to turn left!, turn left!? That's just kind of tolerated in some places where the cops don't want to make waves with the wealthy older community.
A self-driving car never gets tired and sleepy after driving for many hours straight. A highway-bound Waymo would be safer than a few instances of distant past me who stayed on the road longer than I was safe to. They also never get drunk, and are safer than approximately 100% of impaired drivers.
I genuinely think we'll all be safer when lots of people collectively realize that someone other than themselves should be driving.