It isn't hard to imagine politicians grandstanding no matter what Waymo does. If they stop service, and save several hundred thousand dollars in property damage, surely some people will be claiming that Waymo is taking sides, and limiting people's freedom to protest. Or that Waymo is like a utility, and they need to provide service no matter what. What if someone was fleeing riot violence, and they couldn't get a Waymo ride out of the area? Waymo gets a lot more cover if they let a few cars burn first.