 As just outlined, it is controversial whether it is rational to infer the existence of multiple universes from our universe’s fine-tuning for life. However, if we had strong independent evidence for other universes with life-hostile conditions, attempts to account for why our own universe is life-friendly would most likely seem futile. Thus independent evidence for some multiverse scenario could have a strong impact on what we regard as a rational response to fine-tuning for life. Proponents of the argument from fine-tuning for the multiverse could moreover welcome such evidence as potentially helping to motivate a non-negligible prior \(P(M)\) for the multiverse.