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The branch of thought that asks what meaning, responsibility, or even identity can exist in a reality where every possibility is actualized somewhere. If every choice you could make is made by some version of you, are you responsible for any of them? If there's a branch where you're a saint and a branch where you're a sinner, which one is the "real" you? And if infinite versions of you exist across the probability dimension, is death just a local phenomenon, with other branches where you're still alive, possibly reading this definition and wondering the same thing? Spacetime-probability philosophy doesn't provide answers, but it does provide an excellent excuse for every bad decision: "Somewhere, a version of me didn't do this, so statistically, I'm only half responsible."
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