The vast majority of our colleges have become left-wing seminaries. Just as Christian seminaries exist to produce committed Christians, Western universities exist to produce committed leftists… Universities differ in only one respect: Christian seminaries admit their goal, whereas the universities deceive the public about theirs. Thus, in the “social sciences” — disciplines outside the natural sciences and math — a large number of college teachers inject their politics into their classrooms. And if they are recorded, the general public will become aware of just how politicised their classroom lectures are.
But there is another reason. Most professors objecting to being recorded know on some level that they are persuasive only when their audience is composed largely of very young people just out of high school. They know that if their ideas are exposed to adults, they may be revealed as intellectual lightweights. Students therefore need to understand that when professors object to being recorded, it is a statement of contempt for them. The professors are, in effect, saying to their students: “Listen. I can get away with this intellectually shallow, emotion-based propaganda when you are the only people who actually hear it. You aren’t wise enough to perceive it as such. But if people over 21 years of age hear it, I’m toast.”
See, for instance, this first day of a creative writing class, and the examples that follow it, in which attempts to circumvent normal proprieties are passionately endorsed by leftist educators. The subject of some educators’ disdain for students – say, by conspiring to rob them of a chance to hear an alternative view - was touched on here. And for an illustration of just how vigorous and successful those efforts to indoctrinate can be, see also this.