Films that are entertainments give simple answers but I think that`s ultimately more cynical, as it denies the viewer room to think. If there are more answers at the end, then surely it is a richer experience.
I like the multiplicity of books, because each book is different in the mind of each reader. It`s the same with this film - if 300 people are in a cinema watching it, they will all see a different film, so in a way there are thousands of different version...