I guess I need to see the result of this plot point before making any permanent judgments, but...I can't think of a single instance where an anime or manga used rape as a plot point and it actually made the story better. Almost 100% of the time it's just shock value, adding edginess, or a writing crutch to make the viewer think "wow, this a really bad guy, huh?"

Sorry for the cynicism but...bit of a downer after this show being such a stand-out this season.