You forgot to mention them abusing children and planing terror attacks.
No terror stuff, but plenty of anti-Semitic material.
This might very well be true for what I know, but the general idea that optional privacy leads to more hostile environments seems to have been conclusively destroyed by HN and certain other forums, especially when compared to Facebook.
FB is interesting in that you would think that it would inhibit all bad behavior since you are using a real name. But really, people don’t care quite so much. Much improved though! Well, except for the bots, hacked accounts, and bad actors.
From the standpoint of dealing with crap messages, there are no silver bullets. But there are tools. Not everyone knows how to snowshoe, so you can have a decent win with even simple blocks.
That said, Apple/Mozilla/etc know this and so they are simultaneously trying to make fingerprinting more difficult. If they were not, I would agree with Google's stance. But since they are, it is really more of a footnote.