Oooh that's nasty ... Unfortunately 'shock value' is going to get people's attention, and in a world where people are bombarded with so much stimuli there is a need to find a point of difference and in this case, they're trying to play on the most disturbing aspect of the storyline.
It makes sense from a marketing perspective, but clearly not from a moral perspective.
I am going to state that I am one of those people who finds dark movies incredibly fascinating - and I'll go and see something just because I know it's going to be one of 'those' movies. E.g. Hard Candy, Requiem, Baise Moi, The Piano Teacher, Irreversible, The Secretary all fall into that broad genre.
But shoving the media campaign into people's faces in the way that it sounds like those people plan to do is IMO horrific.
I am fairly anti-censorship but the issue for me here is what people are forced to see (both ATL and BTL) is much different to what people can choose to experience.
(atl / btl = above the line and below the line marketing strategies).
Good luck