What about the morality of simulating an environment where sentient beings are produced by a long agonizing process of evolution? Greg Egan points that out here: http://gregegan.customer.netspace.net.au/PERMUTATION/FAQ/FAQ... (question 6). "Post-humans" should have room for a much more robust morality that would preclude someone purposely creating the world we live in - unless we were an unintended byproduct of an unintended byproduct that no "post-human" has even noticed or something.