Deutsch is completely convinced of the reality of the Multiverse, and takes the Many Worlds Interpretation entirely at face value. He accepts that there is, for example, a vast array of universes with different versions of himself in them, so that in some he is (not ‘might be’, really is) a Professor in Cambridge instead of working in Oxford, while in others he is not a scientist at all. On a larger scale, there are many science fiction stories with ‘alternative histories’, in which, say, the dinosaurs never died out but developed human-level intelligence and a civilization to match our own.
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Accepted by blind faith in an unobservable reality and then posited as irrefutable. In a sense, it is because that which cannot be proven using evidence cannot be refuted with it either.
