It's not one class. It's two years of these classes. For example, in a 4-year Computer Science BS degree you get 2 years of indoctrination, 1 year of CS, and 1 year of semi-related stuff like physics. I don't think it is proper to only count time spent in the classroom. Depending on the school schedule (4 or 5 at once? summers?), the required 16 to 30 classes of this stuff will occupy 2 years.
If a person lives 80 years and spends 2 years on this stuff, it is 2.5% of their life. Houses in much of the USA can be had for $100,000. Two years of college can easily exceed that even without including dorms and the opportunity cost of foregone salary. I think you could break $200,000 for two years at the expensive schools, and make that $600,000 if we include trimming a career short by a couple years.
I somehow managed to dodge the worst of this stuff with very careful class selection and a fortunately-timed transfer to a different college. My kids have been hit by unfair grading however, as was my father. For my father: even half a century ago, an assignment to write about nuclear weapons would get you a D- if you argued in favor of getting more of them. (and in case you wonder, he is an excellent writer)
This exposure to a wide range of ideas is not just unidirectional for political outlook. It's also that way by field of study, with the non-STEM majors able to graduate without much science or math. Typically they can get away with something like College Algebra (a repeat of 8th grade), Astronomy, and Nutrition. One shouldn't be able to graduate without Statistics (a calculus-based one), 3 semesters of Physics (again with calculus) with labs, 2 semesters of Chemistry with labs, 2 semesters of Biology with labs, microeconomics, and macroeconomics.