Is it wrong for a woman not to report a sexual assault?

I harshly judge grown women who do not report or otherwise address sexual assault. (I say "address" because I'm super picky about bringing in the police on questionable matters, but saying something about it to mutual contacts often might be enough.) I'm missing the empathy component when some douche assaults one lady after another. I do not understand why someone would not address this in some way: assault is a major deal. But maybe I am being too harsh. How should these women be judged?