It wasn't so much horrifying as distasteful. It didn't help that the rest of the film was garbage either.
The killer inside me was supposed to be horrifying with the face punching of jessica alba, but it sort of didn't look real enough to elicit a reaction, I could tell they were jump cutting frames, and that the reaction to being hit was not realistic, bad makeup also, so no real impact. Stoning...might be a lot worse, real stoning does pretty horrific damage, you might as wel be hammering someones head.