Yechiel; want to know what is against halacha? Going against one’s rebbeim. If they don’t hold of college and say it’s assur, a chosid of theirs is not allowed to go.
Imagine two jews; one is told by his rebbe that going to kosher college is a Mitzvah for him in his situation. Another is told by the same rebbe that it’s assur for him to go. One will gain schar and the other will be punished – for doing the same thing!