Sounds like they couldn't get a babysitter. I haven't seen the movie yet but recently read the books. Definitely not something I'd take my small kids to. I'm kind of surprised it's required reading in schools. It seems too violent to be forced on kids.
One of the things that bothered me far far more than any made up move was on a trip to the Canadian War Museum when I was in grade 8 (so 13). There were pics of dead Jews. Old black and white pics, hard to make out details, not graphic really. But the reality hit me and made me feel physically ill, gave me troubled dreams. The reality of that violence was far worse than any graphically bloody horror film could produce.
I think its a good place to start discussions without having to pull up REAL violence (for those who are too sensitive)