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[1] https://www.cnbc.com/2022/01/26/tennessee-school-board-bans-...
The way I do the math, I wouldn't say they were long gone... I trace the death to approximately 2017. It was a philosophy predicated on a certain amount of tit for tat, and I think that philosophy took a big hit when during a pretty bog-standard protest / counter-protest someone stabbed the left wing protesters in the back (or, more accurately, drove a car into them from behind).
Other people may identify first shot fired in different places... The man in Seattle who got shot and the aggressor claimed self-defense, for example... But enough incidents happened in a short enough amount of time that "defend to your death the right to say it" got supplanted by "No quarter for fascists" and not enough people stood up to shout that opinion down because, well, people were getting killed.
I don't know how one puts the genie back in the bottle. It may not be tractable without people getting tired of violence. And historically, that can take a long time.
Lets not pretend that "the left" only started using violence to silence dissenting voices until after Charlottesville. Earlier that year, there were riots over Milo Yiannopoulos being invited to speak at Stanford. And then a few months prior, there were mass riots at the Trump Innaguration (before he'd even done anything).
Its disingenuous to pretend this isn't a "both sides" problem based on issues of hyper-partisanship of the US over the past 10 (or more) years. I think one way for us to put this genie back in the bottle is firstly, for people to stop trying to place partisan blame, and instead say this is an "extremist" problem, and actually work in good faith to try and reconsile.
Anything less is doomed to failure.
[1]: https://en.wikipedia.org/wiki/2017_Berkeley_protests [2]: https://www.theguardian.com/world/2017/dec/21/trump-inaugura... [3]: https://en.wikipedia.org/wiki/BAMN