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.)
It would depend on exactly how precisely you define "Soviet-style Communism". If you mean, matching the exact same structure and the exact same beliefs and the exact same propaganda and national narrative, no, of course not. If you mean "people advocating for the State to be the one and only source of authority over everything economic, social, and cultural", then, yes, absolutely there are people on the left advocating for this. Quite a few explicitly, and even more people who do not quite entirely realize they are advocating for it, but when asked any specific question about who should have some given authority, the answer is always the State, even if they hypothetically believe that there must be some question for which that is not the answer.
I'm a leftist and pretty widely read and I've yet to read anyone explicitly advocating for state control of the whole economy. For pieces of it, such as Health Care or Education? Sure. For better regulation and wider redistribution? Yep. For municipal control of public utilities? Yep. Even for municipal or state level public alternatives to certain pieces of the economy, like banking.
For the whole thing, Soviet-style? Nope. I haven't seen this anywhere.
So who, exactly, is advocating for that?
Disturbingly, most of the controversies involve people whose views are to the right of center.
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Nor did Buckley think that all ideas deserve a forum. He did not host defenders of astrology, the Ku Klux Klan, Nazism or Soviet-style Communism.
Does anyone of any note to the left of center advocate for Soviet-style Communism?
If the worst views he can conjure from the left are a right-wing scare story and astrology, whereas the worst on the right are murderous ideologies, then I think the first paragraph kinda explains itself.