HaKatan, I agree with most of it. There is this all-american minhag that a 18-y.o. needs to move away from family to an expensive dorm to develop on his own…Jews accepted this – and it works either with colleges and yeshivas and seminaries. Especially for those who go to areas without Jewish community – what is the motivation? If they choose such a college to begin with with parent approval – can we presume that there is a problem to begin with, not with kids in college?
As to hashkafa, I think parents should be more pro-active discussing those before kid goes to college. Most people eventually gets exposed to politics, science, culture. Even if they do not have a fbook, their friends do. My observation is that in many schools, whether modern or not, Jewish and general educations are on separate tracks. English/History/Science teachers might be normal, or they can push various agendas on their own. I guess schools with no English education do not have that problem..