The irony being that that final vision (which the film ends on) is informed by the culture (those books) they have read. It flickers the first time we see it, but it's difficult to see the truth at first.
The film also exploits its cast for the enjoyment of the audience. We're not innocent either – we are the people listening to filthy stories in the library. But if our desires are to be warped by books (or films), at least we should understand what others truly want, rather than using them for our own ends.