Iirc our primary school banned the book series 'Goosebumps'. At the time it seemed a bit daft but now I'm not even sure what they were trying to enforce.
It's not like 8 year old kids are running around the playground in groups of 6-7 reading books together. And there's absolutely no way they could expect parents to stop reading/letting the kids read the books at home because, well if I walked in and found my eldest reading.... anything I'd go out of my way to encourage it.