@blakenstein
how they treat sex crimes so lightly
Isn't this the case with real life as well? Man rapes/kills woman, 90% of the time victim blaming comes into play and the woman is guilty for seducing or egging the man or some other bullshit.
As an example, there was this egregious case here in Italy, last year I think, where a man murdered a woman and the judge, a woman herself, gave him a light sentence because she claimed "emotional turmoil" (not kidding here, wish I were) made him act irrationally, as well as crude comments on how the woman was ugly so few would give a damn about her. That made it to the news and there was outrage, and the judge had to recant her verdict, but it still happened.
Also, as others have pointed out, it's a matter of school image. Expel the punks but do so quietly so the media do not catch wind of what happened (and even if they do, the school would deny it and sue the accusers of slander, faculty word wins over student word)