Peter Hitchens, a former leftist revolutionary, explains in this video why he once sought to restrict the free speech of others and how the left has changed Western society.
Be sure to turn on CC (closed captions) to follow more easily.
The general left-wing belief which is held by the elites of most Western countries now is also a belief in their own virtue. And if you believe very strongly in your own virtue, and your virtue is based on, sort of a caricature of justification by faith alone, you are a good person because you hold certain opinions, therefore if you hold other opinions you are a bad person. And I think that makes dialog pretty much impossible if you think your opponent is bad, not just wrong but bad, why should you listen to a word he says? Well, they don't...
The ideas of cultural, moral and social revolution not by violent overthrow, not through dictatorship of the proletariat, not even through seizure or sequestration of industries and banks but through the capture by the long march through the institutions of the television studio and the university and the newspaper office and the publishing house and the school, so that after 30 or 40 years of that you would control pretty much the public mind and you would be able to get pretty much what you wanted. It's clever, and you have to concede to these people some admiration for their endless determination, their deep belief in what they want and their subtle and clever organization to achieve. It has been very well exercised revolution.
This is a good explanation of the tactics of the academic cycle that promotes M2C, SITH, and other ideas that reject what the prophets have taught. By continuing to suppress alternative faithful ideas, the M2C citation cartel makes dialog impossible.