http://www.seth-smith.org.uk/images/laughter/expletives.pdf
https://www.businessinsider.com/brainstorming-sessions-begin...
http://keele.ac.uk/media/keeleuniversity/facnatsci/schpsych/...
https://www.medicaldaily.com/bad-words-people-who-curse-and-...
What you say about private communities is also true. However, I was referring more to the fact that everybody seem to nonchalantly use violent words and dangerous statements to express their disagreement, i.e., people are not just wrong, they are evil bastards that must be removed from public life and the nation itself.
If you think of stormfront when talking about privacy, you seem to have learned that from pretty strange sources.
"Privacy cloisters extremism" is a pretty insane statement to be honest.
> A clear example of the loss of privacy is the rise of violent rethoric.
And I think that's pretty clearly disproved by the fact that violent rhetoric is almost always deployed in closed, "private" communities. The more closed, the more violent (c.f. stormfront, 8chan, the occasional private facebook group) and the more public, the more moderated and reasonable[1] (c.f. here, or reddit, or twitter).
I can see an argument that the lack of privacy exacerbates differences. But it also cloisters extremism. And the essay needs to at least acknowledge that.
[1] Or at least "nonviolently unreasonable".