You were not to blame Anxious. 
Do you know what? I've been drunk in town more times than I care to remember, back in my misspent youth. I've never been raped - not by someone I know, and not by an opportunistic stranger.
There but for the grace of God go I.
It could've been me. But it wasn't, it was you. Or some other unlucky soul. That's the point - it will always be SOMEONE, as long as the message is 'don't drink', and as long as it's directed at women.
In fact, it's a bit of a lightbulb moment for me. Those days are behind me now, but I've had more raucous nights out than some of the more cautious, conservative, risk-adverse posters on this thread have had hot dinners. I've been drunk many times. Out in public.
I've never been raped or sexually assaulted, though.
Groped, whistled at, commented at, propositioned - yes, countless times, just like every other woman. But I've never been raped.
Mainly, because I simply haven't been in the presence of a rapist - and that's not something you can plan ahead for. So I'm here to counter all the posts from people who have been drunk and raped by strangers/acquaintances, and who blame themselves. I've been drunk and not raped - and that is down to nothing more or less than sheer luck. No cunning on my part, no sensibility on my part, either. Pretty fucking unfair, isn't it...
And I'm also really thinking now about exactly how I frame the 'be careful' message to my DD. The thought of something happening to her is horrific enough - but her then feeling like she can't come to me as Anxious did with her Mum, makes me feel terrified.