" However, if a predator had been looking for 'opportunity', my habit of walking home from a friend's student digs at 1 or 2am could have afforded that. "
A friend of mine back when I was a student was raped when returning home after dark... the thing is, it was 5.00pm and she was returning from lectures. What could she have done to make herself safe? Not gone to lectures? Not done a degree? Well no, obviously that would be absurd "keep yourself safe advice" and it never gets trotted out. Funnily enough the "keep yourself safe" advice only gets trotted out selectively, round activities which (risk of rape quite aside) many people disapprove of women doing - drinking, having one night stands with people they've just picked up. That's the thing about rape myths - they're not really about reducing risk at all, they're about providing rapists with a cultural narrative to use as an excuse to get them off if their case ever comes to court, and about separating women into "good, well behaved, sensible women" and "women who were asking for it."
When I think about my three closest calls, all of which required considerable amounts of persuasion to talk my way out of them - one was with a taxi driver on a contract to the firm I then worked for, bringing me back home from the airport after a business trip, and two were the classic scenarios of "acquaintance on the fringe of your circle of friends offers to walk you home, and you feel socially obliged to agree because 'everyone knows a woman on her own is at risk'". Not surprisingly, I feel safer walking alone or getting crowded public transport - but that is just my perception. I certainly wouldn't generalise to some daft statement about "you can reduce your risk by doing X, Y, Z" based on my small sample of experiences.
Having said that, the stats do bear out the fact that women are far more likely to be raped by men they know than by complete strangers.
The other thing worth bearing in mind vis a vis the "it's all a horrible misunderstanding" theory is that work by various criminologists (especially David Lisak) suggests that when you describe acts which meet the legal definition of rape, but leave the actual word "rape" out of the description, about 6% of men will admit to these acts. When you use the word "rape", the percentage drops to... drum roll... 5%. Which suggests that your average rapist in fact understands consent perfectly, he just doesn't care.