Remember, the Church has not condemned the Harry Potter series. What was expressed about this series by our Holy Father (while he was still Cardinal) is that while he is not a fan, he does not condemn them. (Paraphrased)
Simply put: This series is up to the discernment of the parents with their children. Just because a parent may disagree with the series, does not mean that another parent should be told not to allow their children read or watch the movies.
As an aside note: I have read the entire series, and watched each of the movies that are out so far. I own all the books and movies, and while I find them ok for adults to read, I would advise other moms to not let their children read the books until they have become teenagers.