In my experience living in SF, these cars are much safer than the typical drivers in my neighborhood for pedestrians. Most human drivers around here don't even bother to stop at stop signs, and instead just slow slightly. With the cruise and Waymo cars, I feel like the risk is a bit lower when I'm on my bike or walking.
I have witnessed a Cruise car stopping in the middle of the road when faced with an oncoming emergency vehicle, so I totally buy that they aren't ready for prime time yet.
Honestly, I'd prefer if we prioritized enforcing existing traffic laws for regular vehicles.