Of course sexual assault should be taken seriously. But, to MIR's point, I don't think many sexual predators are considering punishments or even the campus culture. It's a bit of a stretch to assume that predators would choose a particular school because they view the campus culture as more conducive to preying on women.
This is only one study, but I'm guessing one would find similar results elsewhere.
The findings suggest that 76% of active criminals and 89% of the most violent criminals either perceive no risk of apprehension or are incognizant of the likely punishments for their crimes.
http://www.businessinsider.com/do-criminals-think-about-getting-caught-before-committing-a-crime-2011-9
Using stats about "criminals" in a specific type of crime thread is pretty useless.
Even stuff like this that broadly speaks about sexual violence isn't great.
http://studenthealth.emory.edu/hp/respect_program/understanding_the_perpetrator.htmlMen are more likely to commit sexual violence in communities where sexual violence goes unpunished. (National Sexual Violence Resource Center, 2004)
And that study is talking about a broad generalization about sexual violence/rape/honor codes/punishments across the world, not johnny frat boy.
But it's not hard to find some trends in how assaults occur, even if we don't get a great profile about the individual rapist. Society tolerating it and not valuing a woman's complaints is key to allowing the culture to flourish.