But ultimately this isn't about "get drunk and you'll be raped, stay sobour and you won't," it's about common sense.
Because people often put themselves in situations where they make themselves more vulnerable, be that through getting so drunk they are not acting normally/walking the streets late at night/wandering around a dodgy area alone/giving a lift to a stranger and so on...
In an ideal world it would be ok to do these things because we wouldn't be at risk of being mugged if we walked the streets alone at night, or at potential risk if we got into an unlicenced mini cab (be that drunk or sobour), or be more vulnerable if we got so drunk we didn't know where we were/what we were doing.
But this isn't an ideal world; it's the real world. And ultimately, while we all might be at risk of being raped/mugged/ripped off, there are things we can do to try and limit those risks.
A sobour woman might be more inclined to perceive the rapest in the pub as creepy and might not engage. If she's drunk her judgement is impaired and she might be more inclined to engage, and therefore the opportunity might be more likely to present itself.
The woman who walks the street at night might decide to get a lift home instead, and therefore the opportunity for her to be mugged would not present itself.
Ultimately we do need to be aware of the risks that are out there. And in part it is our responsibility to try to protect ourselves against those risks, prevention is better than cure after all.