That girl has been my friend, JLM, and you probably know at least one silent person who's been through a similar situation. Only in my friend's situation it was alcohol induced, and happened at a bush party, not a rave. People saw, but no one saw 'force', she wasn't unconscious, but she also wasn't saying yes. Everyone who saw was drunk, no one could say 'she said yes' no one could say 'she said no'. They could attest to having seen sex happen but the docs and cops already knew sex had happened, so what more was there to say? Coming forward only would have gotten them into trouble with family for having been there in the first place, all for the sake of saying 'I don't know what I saw'. There was no public plea for information, because there was no internet to speak of. There was no desire on her part to spread it through news papers because she knew the limitations of what people had seen.
You spoke of wanting to tighten up laws surrounding drugs, it won't help prevent this type of thing from happening, or make witnesses to drunken deeds suddenly sober and aware of what's happening around them. That doesn't make me part of the problem, it simply makes me aware of the limitations of the law, and the habits of humanity. There's a jadedness that comes from having seen the limitations of 'he said she said' in the law, and having had to accept it.