Put another way, the trick of film (or any art) is to say something that cannot be expressed by language. It is ineffable. If you COULD just say it -- you would just say it, because that's shorter and simpler and a lot less expensive. The essence of "No Country For Old Men" certainly has more richness than the simplicity I've boiled it down to, but if we ARE going to use words, which is an obvious necessity when communicating these ideas to each other, then the core themes are going to seem simpler and less rich than they really are.
Yes, the central themes of the film really are "the world is an insane, cruel place," but you are correct that it's a lot more complicated than that. It's just... words don't justly express that fuller, richer meaning.
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