I remember the fuss about that one from the Daily Mail. But I never watched it as it sounded like it was trying too hard for controversial. Maybe I misjudged it.
It's a somewhat dark film, but I can't say it made much attempt at controversy, at least not to my interpretation. The script is fairly matter-of-fact, though I'm sure some people would be riled by it regardless. Of course, that's just my take on it.
On the other hand, maybe it does try to stir something up, in a way that doesn't come across to an American viewer.