I understand what you’re saying, but if this unequal silencing is so obviously a real phenomenon and isn’t simply a reflection of the views being espoused - then it should be easy for the author to come up with examples. And it’s not just this author. It’s every author I’ve read commenting on this ‘phenomenon.’ They always say that it’s right-wing voices being silenced, but never suggest what left-wing voices should be silenced that aren’t.
So I invite anyone to suggest the left-leaning equivalents of Nazism and white-supremacy.
(And by equivalents I don’t just mean viewpoints, I mean comparable levels of influence. Some random bloke on the web claiming to be left-leaning and saying that their race is superior to whites isn’t the equivalent of white-supremacy as a movement.)