Simple solutions are for simple problems. This is not a simple problem and your condescending and vaguely angry posts are not helping your position.
If it’s so simple, why does every campus struggle with this issue?
Let me list the consequences for drinking that are posted on every door in my dorm at move-in.
So if a minimum $500 fine, going to court, getting their license suspended for 12 months, possibly losing their housing AND “other sanctions” as the university sees fit doesn’t do it… Why on Earth do you think it’s so simple? What will expulsion do that losing housing won’t?