I appreciate this line of argument, but college students aren't really adults in the full-blown sense of the term.
I'm an old school faculty member in the sense that I really like the "look to your left, now look to your right" style of introduction to college. When I was teaching, I never took attendance or considered attendance in my grading, because if a student can not attend and still ace my exams, good for them. I mean that sincerely. I taught myself math, so I'm very sympathetic to this avenue of learning.
But my 19-year-old self was nowhere near as community-minded as my 48-year-old self. Realistically, you don't get thousands of college kids together in one place if you're not prepared for them to hang out together. That's what college kids do. University administrators who don't realize that are simply incompetent, in the sense that they don't understand their core consumer base.