Luckily as an atheist I can just appreciate fantasy for what it is......Fantasy. For theists however if you believe in invisible gods then magic, ghosts and demons all become real too. And anything that does not seem normal too you, which is pretty much anything in fantasy land, is evil.
This is one of many reasons theists irritate me.
Here are some examples of idiots telling your children (or parents who believe in fairy tales) not to watch certain TV shows and movies.
Idiocy and Harry Potter