I mean, if a BYU professor telling you something unsavory about Church history turns you away, it would sort of seem that a school with pervasive drinking and actual radical liberalism would also turn you away. I dunno.
Students are going to fall away at BYU. As they will at every university. It's what happens when a child goes from being 17 years old to 23 years old. They begin to think about broader world views.