My kids come from a long line of children who have read books that have since been banned for one reason or another: James and the Giant Peach, Harriet The Spy, Anne Frank: The Diary of a Young Girl, and The Wonderful Wizard of Oz, The Outsiders, and A Wrinkle In Time. It really never even occurred to me to forbid my own children from reading something when they were young.
When the "Goosebumps" series became "the" thing to read for, grade school kids, my eldest devoured them. He must have read thirty of them. My mother was appalled. But he was reading and I was thrilled by that. If they had influenced his behavior in any way, then we might have had to look at letting him read them. But they didn't. They gave him a fun escape and reinforced the idea that reading can be fun in a lot of ways.
So they read scandalizing books including Charlie and The Chocolate Factory (poor philosophy of life), The Lorax (it criminalized the foresting industry and would encourage children against logging), Where The Wild Things Are (promotes witchcraft and supernatural events), Harry Potter (promotes godless witchcraft), Strega Nona (magic), Scary Stories To Tell In The Dark (because scary, of course), In The Night Kitchen (nudity), and The Adventures of Captain Underpants (apparently seeing characters in underwear is dangerous?).
All of that and not one of my kids has been drawn into witchcraft or chained themselves to a tree in protest (although I wouldn't really have a problem with that) or try to to school in nothing but their underwear and a cape. I doubt very much that they even really noticed that the little boy in In The Night Kitchen was naked and, quite frankly, they liked being scared by their books.
Not only have I never felt that my kids were harmed by anything they read, I have always felt like the learned something from everything they read. They learned that it's okay to be silly, to dream, that one individual can make a difference, that they should surround themselves with people who love and support them, that sometimes life is scary and sad, and that good things can happen when people stand up to evil. Most of all, they've learned to think for themselves and form their own opinions. All of the things that their dad and I have been teaching them all of their lives.