It's clear you want everyone to be like Johnny Manziel and allow people to destroy their lives. BYU is better than that and works with individuals on a case by case basis to help them make correct choices. Sometimes when given enough chances to correct mistakes, BYU lets some students go. That's why they handle things on a case by case basis because sometimes they do and sometimes they don't. That's the same reason why we as a society handle trials on a case by case basis. I highly doubt BYU takes all alleged rape victims (how many have there been anyway) and starts investigating them for honor code violations, and then when they find something, they try to get rid of these problem students.
It's not just about the societal cost that BYU is interested in. It's very costly to that individual and that matters just as much to BYU as the societal cost. If you don't believe that then you don't understand the purpose of the church that owns BYU, and that's what you didn't understand from my post.
Everyone against the honor code in this situation is so fired up about it. Most other people that realize the inherent tension in these situations appear to me to be more thoughtful. I didn't mean those first few sentences, but if I wanted to present my understanding the same way you and others criticizing BYU present your side (e.g., "your perspective is way out of whack here"), that's what it would look like. Just FYI.