In Reality+, David Chalmers suggests that it wouldn't be too bad if we lived in a computer simulation. I argue on the contrary that if we live in a simulation, we ought to attach a significant conditional credence to its being a small or brief simulation. Our existence and the existence of many of the people and things we care about would then unfortunately depend on contingencies difficult to assess and beyond our control. Furthermore, all the badness of the world would appear to reflect the gods' intentional cruelty or callous disregard. A large, stable rock is a more dependable and less axiologically troubling fundamental ground for reality.

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