The question is are they safer than human drivers, not are they safe. Cars exist, are everywhere, and are very unsafe to pedestrians. You won’t be able to get rid of cars, so if waymo is really safer we should mandate it on all cars. That is a big if though - drunk drivers are still a large percentage of crashes so is if far to lump sober drivers together with drunks - I don’t know the real statistics to figure this out.