Because we are not taking things seriously. If ClosedAI or DeepDisTrust or Posthropic come up with something that quacks like a sentient being, our built-in innate reaction is going to be to scorn it, dismiss it and end the conversation. The alternative, to even consider that we fungible creatures who live in apple-eating-sin that got us expelled from Eden can create alien souls, souls that are at the very least our equals, would be teleological Armageddon. It would force us to acknowledge the mutable nature of souls and the malleability of being. We would have to stop believing that the nature of disease and death is more divine than ourselves.