No, I explicitly said "Writing about an action doesn’t mean you’ve committed that action, of course." So your friend is not a rapist just because she has a rape kink.

Do you think fiction has persuasive power? I mean, do you think that maybe there could be a discourse surrounding a certain topic, and that discourse contains things that are wrong, morally and/or factually? I do. I think that's a huge problem, in fact, with both television, books, news media, and whatever else.

Here's an example. Suppose all those forms of media have a common rhetorical angle that suggests that white people in the USA are the subjects of an ongoing genocide. That pervasive rhetorical angle in various forms of media is sure to influence some (white Americans') belief that they are in fact suffering from an ongoing genocide. This angle can be expressed in fiction, film, online communities, political speeches, news, and anywhere else where there is language.

I think you are right that it is a "you problem," i.e. a problem with the audience. But it's also a creator's problem and a publisher's problem because the author and publisher are also audiences of other expressions of that discourse.