But I am a little leery of the idea that the victim is always powerless & the perp is always powerful.

I don't like that idea either, nor do I live as if it's the case. And as an ACOA I have a pretty strong squick against being around intoxicated people which causes me to avoid them, and I know that helps keep me safer.

But I have seen many discussions on the blogosphere recently of specific rape cases that very quickly attracted a lot of comments along the lines of "She did X, she was wearing Y, she was in Z location, what did she expect?" I think that's where the meme came from.

Good point about men being subject to violent assault.