People might not claim copyright infringement if you resold an edited book, but it would no longer be the book you originally purchased.
These companies present their movies as a product of their original directors and cast, but they aren't that at all; they're a different movie altogether.
These companies are just profiting from work that's already been done. If they want movies that are free of things they find objectionable, they should make them themselves, instead of perverting the work of others.