> And it's not always a reactionary act. It's sometimes for pragmatic reasons - to prevent or curtail a non-ideological issue.

Literally all of the examples in #Cold_War_era_and_1990s either were explicitly ideological, or seem plausibly likely to have been ideological, and the latter are all along the lines of "Well, they might have had a personal grudge against the author." or "We don't have any idea why they commited arson against a library.". Do you have any specific examples of attempted curtailment of a non-ideological issue? (No, "but our ideology is RIGHT!" doesn't count; denying people that shortcut is more or less the point of free speech.)