Nate:  This was a case of "he (they) said/she said".. she claimed sexual assault, they claimed consensual sex.  I am not the "judge" of whose story is "true", nor are you.  If you read my comments made at the time of the incident, you will find them very critical of the young men's actions and supportive of the University's decision to apply the student conduct code and expell them.  

You write "A woman was raped. The event itself is not alleged."  This indicates you fail to grasp the essence of the issue.  The men admitted sexual contact with the young woman, both at the party and the next morning in one of their apartments.... However, they contended it was consensual and consensual sex between or (as in this case) among adults (over 18) who were not "incapacitated" and could make a decision to so engage, is NOT a crime.  That's the key here:  The DA felt he could not convince a judge or a jury that the crime of sexual assault had occured.  Please study the case...

(cont)