Most colleges and universities are not what they pretend to be. 

They are not places for inquiring minds to learn in an open market of ideas.  In fact, many house faculties which systematically attack and often exclude ideas and people in favor of true academic freedom -- especially freedom to give fair consideration to conservative and libertarian philosophy.
 
No wonder the college experience turns so many students to the left.

Because textbooks shape the mindsets of the next generation:  "The textbook is the reigning elite's means of establishing a common world-and-life view among the young. What the textbook contains is not so important as what it leaves out. It leaves out evidence of rival views.