This all reminds me of a something Neil Gaiman wrote addressing the immediate knee-jerk response to ban his children's book "Coraline" from certain libraries because it was seen as too scary for kids to handle:
”And my answer to 'is Coraline too scary for six year olds' is, I don't know. What sort of thing does your six year old like? I think a good rule of thumb would be, that if your child can cope with The Nightmare Before Christmas and the original Wizard of Oz then they should be able to cope with Coraline just fine. As a general rule, Coraline the book is much creepier for adults than it is for kids, who tend to read it as an adventure."
Seems like a level headed answer to the question. Instead of banning books, know your kids. And please respect their intelligence. (Unless of course you have stupid children)