If they're churched kids, it's the family's and church's job to see they're educated against such nonsense. If they aren't churched, they're exposed to a lot more than Harry Potter, and burning harmless books - as opposed to harmful ones, which do exist - just means they aren't going to listen to us.
*** it's the family's and church's job to see they're educated against such nonsense***
"Such nonsense" being Harry Potter - I assume!
:)