Earlier quoted context omitted.
This happens because there's a lot of cultural bias towards being centrist, being perceived as the reasonable middle. People like that a lot, it feels good, so whenever such people try to describe political disputes it's tempting to try and describe both parties as the same when arguably they're not. This Substack article is a good case in point. It makes it sound like there's two sides, both demanding censorship, an…
This seems to be the public perception: only one side demands censorship. This isn't quite true and only shows you how well one side is at publicizing that they're being censored, which, ironically, means they're censored -less-. Palestinian accounts on facebook have been deleted for years when they were trying to report on occupation. Facebook also deleted all the accounts of Nicaraguan socialists trying to counter…
I don't know about Palestinians and Nicaraguan socialists. Are they demanding that their critics be silenced? I doubt they're in any position to even imagine demanding that.
"It's an old (very, very old) insight that rules for censorship are made with the excesses of the right as legitimation for it, and then used against the left."
Maybe it's old because it's no longer true? I'm approaching middle age now, and the best examples of right wing censorship I can think of are all related to sexual morals and porn. But at least in the UK left wing parties usually support censoring that stuff too, e.g. here's an old article about the current head of the UK Labour Party being concerned about internet porn and other Labour party figures supporting the idea of internet censorship:
https://www.dailymail.co.uk/news/article-2169509/Internet-po...
If the left has ever been the side of free speech it must have been some time before I was born. I suspect the reality is that the people who want censorship are typically those in power or most aligned with power, and that swings back and forth over time.