Free Speech for Me--But Not for Thee: How the American Left and Right Relentlessly Censor Each Other (1992) [1] is a good read on how we got to a point where our ability to communicate across ideologies appears to be broken in many ways. For example, in 1963 Yale disinvited George Wallace, who was popular in the deep south, as a speaker. As a result, observers were deprived of a chance to hear opposing speakers' argu…
I blindly accepted your claim that Wallace was not permitted to speak at Yale. That's not true. I regret not being more skeptical. I am fail. Please accept my most humble apology.
TLDR: Yale Political Union invites Wallace. President Kingman Brewster Jr blocks. Much drama. Including local black leaders and civil rights activists, who defended Wallace's appearance per principles of free speech and academic stuff. Brewster removes block. Two student groups reinvite Wallace. Wallace declines, though he did speak at other Ivy League schools.
Described more fully p104-106 in Hentoff's book "Free speech for me--but not for thee", which you cited.
Here's 4 more articles, to round out the reality-based version of that incident:
https://yalecollege.yale.edu/get-know-yale-college/office-de...
"Free Speech, Personified" NYT [2017] https://archive.ph/LvAHn About the 1963 incident, how Pauli Murray appealed to Brewster to let the white supremacist speak, and how Yale recommitted towards and continues to uphold free speech.
Blurb from 1963 about the incident. https://www.thecrimson.com/article/1963/9/27/yale-provost-br...
Report of the Committee on Freedom of Expression at Yale [1974?] https://yalecollege.yale.edu/get-know-yale-college/office-de...
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FWIW, I now don't understand your other cites. [2] Is just common sense. [3] Unrelated. [4] Might be broken.
Though I do agree with Jack Newfield that mocking racists and neoreactionaries should be avoided. We now know that right wing partisans are personally insulted when their leader is criticized or mocked. (Probably something about having their identity wrapped up in the demagogue. Who knows.) So mockery just drives those partisans further away.