Other answer:
Because we don't think telling people not to rape is as effective as telling women not to get raped. Or telling men how to stop something uncomfortable in the middle of happening, or even that they should.
That's true, but I feel like the US treats crime in general like that. We don't like to admit that criminals are people, or that potential criminals can be stopped.
Basically, It's like proposing that a rapist is going to read an article on how not to rape. They just aren't going to read it (e: or care about it.)
Andir is unintentionally providing a good example of this here. The implication here is that anyone who will ever in their lives commit any form of sexual misconduct/assault is already a "rapist" who cannot possibly give the least bit of a damn. There is no acknowledgement of the fact that there's a first time for every offense, and that in some social circles (such as many within universities), there is actually pressure
on men to engage in the kind of behavior and thought processes that make rape (particularly, say, date rape) likely or acceptable.
Seriously, if we're going to put so much pressure on women to be careful and prevent their own rape (which is not
always bad advice in itself), then we need to put
even more pressure on the elements of society and culture that make those assaults so damned likely to begin with. When you do the former but not the latter, you make it seem like not getting raped is entirely the responsibility of the woman.