Colleges and universities should be "overwhelming(ly) liberal in nature." Students should be exposed to all ideas. And I mean liberal in the traditional sense, not the political. Given that, you are absolutely right on with your last statement.
From my experience, yes, colleges tend to have more liberals (in the political sense) than conservatives. I'd say it's due to the generalization that conservatives who do post-grad degrees are more inclined to go into the private sector because it offers greater financial rewards, and (we) liberals tend to go into higher ed because we're less concerned about the financial reward and prefer the life-style.
Even though there are more liberals on campus than conseravtives, I have had students tell me stories about being forced to accept ideas from both liberal AND conservatives profs (by "forced" I mean they better write papers or answer questions that support the prof's leanings). However, these have been rare instances. Like so many issues today, people like Horowitz take these rare instances and make it sound like a pandemic.
One of my best friends on campus is a conservative historian (our history department actually is overwhelmingly conservative), and we argue all the time about issues (it helps that we mainly do this at the campus watering hole). This is what education is about.
I wonder how diverse the convesation is at Liberty College?