I'm really trying to think about art here. What's it for? I can understand a novel about a rape of a pre-pubescent or just scarcely pubescent girl, I'm wondering about a movie. And it depends on what scenes are filemd and shown. I can barely imagine an artful portrayal of a rape, but it's hard for me to imagine that I would be in anyway edified by an "artful" portrayal of the rape of a child. And it sounds like that's what they're offering here.
Well any aspect of the human experience is fair game. Not having seen this I couldn't tell you whether it's in good taste (whatever that would mean in this case). Someone like Hitchcock was known for artful ellipsis in depicting various depravities but when he finally got free of the old Production Code he produced one of the most explicit rape scenes ever put on film at the time (Frenzy).