It is not necessarily the professors and the classroom instruction that wraps students with a blanket of Progressive world view. It is all the stuff on campus and as part of campus life outside and in between classes.
At orientation, the student hears one or two or three or four talks where inclusion and diversity is either a component of the talk or the main point of the talk.
From the dorm room to the class room, the student passes a bunch of flyers and announcements. Join the physics club. Join the Quidditch club. And several more promoting LGBTQXYZ and/or lamenting the oppression of LGBTQXYX. The left wing extra-curricular activity dominates the content of political interest, and nearly as much as the innocuous stuff.
College is where young people learn to watch Saturday Night Live, Jon Stewart, Stephen Colbert, David Letterman, and whichever other leftist sleazeballs hold late night court on the entertainment channels.
The extraneous and expensive overhead offices of the university include the Dean of Race, Dean of Racism, Dean of Multiculture, Dean of Global Warming, Dean of LGBTQ, Dean of Green Earth, Dean of Non-Oppression, Dean of Multiculture Awareness, the Dean of Open and Affirming, the Dean of Inclusion & Diversity, or a variety of some such things.
And then there are the activist professors in the Humanities and Arts sections.
I agree with your statements. It is the entire college environment, that is overwhelmingly liberal/leftist, that simply surrounds a student with only one acceptable point-of-view. At the same time, if the professors were more balanced, they could counter-act the social culture of the campus, by pointing out the pervading liberal groupthink. The professors are liberal/leftist and also too cowardly to stand up and demand that both sides be heard.