I actually think that you are probably right, and in the last year I got more sympathetic to total utilitarianism because of coherence arguments like this. It’s just that the more common-sense factions still hold way more than one in a hundred million seats in my moral parliament, so it still feels like an obviously good deal to give up on some planets in the future to satisfy our deep intuitions about wanting Earth society to survive in the normal way. I agree it’s all confusing an probably incoherent, but I’m afraid every moral theory will end up somewhat incoherent in the end. (Like infinite ethics is rough.)
I actually think that you are probably right, and in the last year I got more sympathetic to total utilitarianism because of coherence arguments like this. It’s just that the more common-sense factions still hold way more than one in a hundred million seats in my moral parliament, so it still feels like an obviously good deal to give up on some planets in the future to satisfy our deep intuitions about wanting Earth society to survive in the normal way. I agree it’s all confusing an probably incoherent, but I’m afraid every moral theory will end up somewhat incoherent in the end. (Like infinite ethics is rough.)