[idontwantthis]

Exactly. The main reason these rules are great is that it makes students comfortable with calling an ambulance when someone has alcohol poisoning. If drinking is illegal on campus, then you criminalize alcohol poisoning too and students die as a result. My university had a similar, but not as regimented policy as Stanford. It allows the administration and the students to understand each other.

Edit: Besides alcohol poisoning, you also decriminalize injuries and re-criminalize sexual assault.