This is a brilliant analysis by Glenn Reynolds (Instapundit) about free speech being thwarted at universities. This is a bit from a story he is commenting on:
Here is Reynolds analysis that is spot on IMO:
In retrospect, it seems like that was really just a way of defending communists at universities, one that’s been discarded now that the communists are in charge.
I think it's probably a mix. Some actually believe in free speech. These would be your Democratic political figures from the Cold War era, most of whom were hostile to communism and were educated before college campuses became overrun by radicals. They were liberal in the sense that they believed in civil rights and liberties (including the right of free speech), wanted a strong central government to aid the poor, supported labor unions, etc. They weren't radicals and didn't harbor contempt for traditional American institutions.
However, for others, the free speech issue was one of convenience not principle. These were actual believers in communism, or even if they didn't specifically embrace Marxist-Leninist thought, they were radicals who were allied with communists because they shared their contempt for traditional American institutions like family, free enterprise, the military (though this is less true than it used to be), and churches. I don't use the term "liberal" to define these people, because they aren't liberals by any definition. In fact they are the opposite of liberals. They are totalitarians, which is why I usually refer to them as the Left or hard Left.
I think we've probably had Leftists on college campuses for a century or longer, because their views were unpopular, which made places of free inquiry and thought attractive to them. Universities used to fit that description. However, in the '60s, they started to gain a real foothold (aided in part by naive liberals), and by the '80s and '90s they started to outnumber the non-radicals on campus. Now they dominate. In light of that shift, it's not surprising that free speech has become less and less of a priority on campus. It's also not surprising that college graduates have become more and more Leftist over the years.
Of course the danger is that when free speech goes away (which happens when all speech is suppressed or when there's viewpoint discrimination in what speech is protected by the state), it is replaced by force. Groups will form their own security forces, which turn into paramilitary forces that sometimes commit acts of violence and intimidation. Combine that with radical positions and practices that encourage racial, religious, and ethnic tribalism, and we could see a very toxic combination over the years.