Waymo has caused a single crash in 5 million miles of driving and no one was hurt.[2] They have been involved in slightly more incidents than would be predicted for a human driver (30 vs. 21) in those 5 million miles but it was not at fault for the others.
[1] http://fortune.com/2018/06/30/uber-lyft-poor-minority-commun...
[2] https://www.wired.com/story/waymo-crash-self-driving-google-...
Second while the number is still a low enough number not to be particularly relevant other than to say the gross order of magnitude. However...
Google's autonomous vehicles have crashed 36 times in the Mountain View area
https://www.businessinsider.com/cruise-waymo-apple-which-sel...
Waymo spokesperson called the research "deeply flawed" and said it "reflects a poor understanding of the data as it fails to distinguish between a vehicle that drives hundreds of miles per day on public roads, with one that seldom leaves its garage."
In other words they don’t disagree with the number of crashes, even when excluding other areas.
I'm not sure what new argument you are attempting here. Mountain View has lots of heavily residential areas if you are implying otherwise.
The Waymo spokesman is completely right, this is a very stupid way of ranking safety. This article is more recent than the one I cited and includes more than twice the number of testing miles so the raw number of incidents is unsurprisingly higher.