"There's no living with a killing," Shane tells Little Joe, and Logan echoes in a speech to Laura. "Right or wrong, it's a brand, a brand that sticks. There's no going back." For all the deification going on in Shane and Logan, both heroes make it clear that there are some actions for which there is no redemption.
James Mangold holds a mirror up to Logan and reflects him back as Shane. He miraculously pulls it off, doing something that audiences and box-office watchers have already established, but few critics were ready to admit it. The superhero movie is no longer just quips, spandex, and fan-service. It's a major American genre, and one that is malleable for the silly and the profound. And Logan is the most profound one yet.