I wish I could clone myself. They always are made up bits of different people. But mostly it's silly. Well, Halloween and witches are sometimes frowned on as you've heard. In younger books, nothing too evil or cruel is desirable.
Young kids can get scared by something that seems innocuous.
So many have been done but they always need more. The trick is to find a new fresh idea for an overdone holiday. Say, spaceships and dogs or mining and toothfairies. I love meeting other authors, editors, teachers, etc. I'm fascinated with how everyone does the same job differently.