I can't figure out how to directly link to it but a review that put it in perspective for me:
"... It is interesting to note that this film is not that bloody, with almost all of the violence occurring off-screen, the camera focusing on the witnesses reactions instead. Funnily enough, this annoyed a few reviewers on this site, which kind of proves the director's point. We are hungry for violence in our films, we want to see it all. (source)"