But to me, the reality of the story turns it from "Ooh, I'm creeped out, this is fun," to "Oh, ew. I just enjoyed listening to a story in which actual people suffered and died." It's like that image macro of a guy's hands holding a fortune cookie over an empty plate, and the fortune reads, "That wasn't chicken." I'm iffy on using real people in stories - it has to be done either completely goofy (like Bill Murray in "Zombieland") or very truthfully to alleviate my concerns, and in general the more of a "celebrity" the person involved is, the less uncomfortable I am with it. Here, we have a very private, very personal set of events that was just used to titillate me. I'm okay with being pleasantly unnerved by a story about a preteen murderess when I know it is fictional (though I do prefer it when an author does more than just go, "Hey, isn't this creepy?") When it's a story about actual events... I don't care to have them told to me in such a way as to evoke such an emotional reaction.
FWIW, I have the same feeling and reaction to, for example, that appalling mess with the Casey Anthony trial (which you probably missed, kibitzer, being as you're on the other side of the world from it. Basically, a mother killed her 2-year-old daughter either through neglect or through malice, and the trial was really popular as way to boost ratings for news shows. Everyone had an opinion on it. I turned off the TV in the employee break room rather than have to watch it.) I'm not saying real events should never be retold or fictionalized in any way, but I do kind of resent springing it on me as a surprise at the end after presenting the story as pure fiction. I'm much more willing to read/hear appalling and disturbing things used for artistic effect when I know they are created specifically for that purpose. Using reality feels... disrespectful, a violation of privacy, especially with the rather grotesque sexual undertones and the emphasis on her inner thoughts that we saw in this story.