But single examples don't prove anything. Yes, you have to meet a rapist. Yes, that can happen at any time, and when you're wearing any clothes. Yes, there are more rapes that happen when the victim knows the attacker than when the rapist is a stranger. It doesn't mean that it isn't still sensible to take some precautions that might reduce your risk. Doing so doesn't make it your fault if a rapist decides to rape. Doing so doesn't make it right that he does.
I think it's patronising to imply that those people who don't have a problem with the poster are just not enlightened enough to see it yet. It doesn't mean that they are determined not to see it, or that it's too subtle a view, or that they aren't tuned into that sort of thinking. It means that they might have considered both viewpoints, and still decided that they think it's OK. There are many other examples of victim blaming that I do have a problem with.
I think for me, the consequences of being raped are worse than if I were attacked in other ways, and thus even those other crimes might be more common, and even though the risk of violence might be greater for men overall, I feel more vulnerable. I don't think I can eliminate the risk and I don't want to take such measures as locking myself up all the time; I do, however, do some small things like trying to walk in lighted areas or where there are other people. I don't think it's my responsibility or my fault if it happens. I wish I didn't need to do any of it.
It also doesn't mean that railway companies and stations shouldn't also be putting measures in place like more staff and guards and so on; it doesn't need to be either/or.