Years ago they banned the book Puberty Blues for the very same reason, even though Puberty Blues is about as close to real teenage life as you can get - it's a book that resonates through the generations. Same thing with harry potter - fair enough a lot of the 'argument' with those books were the witchcraft v religion issues but personally I think it's because a lot of the issues and themes that are in these books are just too complicated for young kids kwim? Personally I think books are fine so long as you know your kids are fine with reading them and understand the difference between fiction and reality.