And perhaps the best remedy to bad speech is more speech. Let an entire range of arguments and facts and examples be heard.
I think some of these cases might be where you have things like the "president's lecture series" where it's being perceived as the university putting their stamp of approval on a speaker. Perhaps the most elegant solution to this is don't have the goofy "president's lecture series"! Spend resources in a more open way where a broad range of views are being invited.
I participated in the peace movement Fall '90 in the run-up to the Persian Gulf War. At a large public state university, you can't distribute flyers just as a student. You have to be a student organization. And to become a student organization, you have to have at least two people who attend an orientation held only a couple of times a semester ! ! Fortunately, we had a couple of people good at completing these kinds of administrative tasks. As far as the university, primarily a kludge-ware bureaucracy. Afraid of trouble, problems, that kind of thing, and yes, occasionally, probably someone's personal agenda.