have seen the movie yesterday. And yes, the killer(s) motives are really hyper-relevant to today’s society, and cleverly derived. can't say much because any detail would give to much, but it's all about how our actual society may turn, by its code, young people into murderers.
I liked the movie. The opening scene with Anna Paquin and Kristen Bell is original, even if it's the only real originality of the movie.
My only complaint would be the too long and sometimes far streched climax (but it's an autoparody, I agree, there is a lot of self derision in the movie). The killer(s) is/are unmasked for more than 15 / 20 minutes before being taken down.
But it wasn't a bad movie, and the killer(s) was/were more interesting that Mrs Loomis or the murderous half brother (but billy and stu were better, i must admit).