 The arguments that we should accept the calculations that predict failure of unitarity at face value are straightforward (Unruh and Wald 2017). The calculations represent a regime (the semi-classical one) in which we have good theoretical grounds for trusting our theoretical machinery, and nothing is required that deviates from standard applications of quantum field theory and general relativity, respectively. Even though there is failure of unitarity, there is no violation of conservation of probability—all quantum probabilities sum to 1 over the course of the entire evolution—and there is no other manifest form of indeterminism present. Nor is there any violation of energy conservation attendant on the failure of unitarity, as some have alleged must happen. Unitary evolution, moreover, is arguably not a fundamental tenet of quantum theory: so long as probability is conserved, one can calculate with confidence. Indeed, there are examples of just such non-unitary, but probability-conserving and energy-conserving evolution in standard applications of ordinary quantum theory, with no need for anything as high-falutin' as quantum field theory on curved spacetime and black hole thermodynamics (Unruh 2012). 