To those who say "Nothing is real," I once replied, "That's great, but how does the nothing work?"
Suppose you learned, suddenly and definitively, that nothing is moral and nothing is right; that everything is permissible and nothing is forbidden.
Devastating news, to be sure—and no, I am not telling you this in real life. But suppose I did tell it to you. Suppose that, whatever you think is the basis of your moral philosophy, I convincingly tore it apart, and moreover showed you that nothing could fill its place. Suppose I proved that all utilities equaled zero.
I know that Your-Moral-Philosophy is as true and undisprovable as 2 + 2 = 4. But still, I ask that you do your best to perform the thought experiment, and concretely envision the possibilities even if they seem painful, or pointless, or logically incapable of any good reply.
Would you still tip cabdrivers? Would you cheat on your Significant Other? If a child lay fainted on the train tracks, would you still drag them off?
Would you still eat the same kinds of foods—or would you only eat the cheapest food, since there's no reason you should have fun—or would you eat very expensive food, since there's no reason you should save money for tomorrow?
Would you wear black and write gloomy poetry and denounce all altruists as fools? But there's no reason you should do that—it's just a cached thought.
Would you stay in bed because there was no reason to get up? What about when you finally got hungry and stumbled into the kitchen—what would you do after you were done eating?
Would you go on reading Overcoming Bias, and if not, what would you read instead? Would you still try to be rational, and if not, what would you think instead?
Close your eyes, take as long as necessary to answer:
What would you do, if nothing were right?
Well, to start with I'd keep on doing the same thing. Just like I do if I discover that I really live in a timeless MWI platonia that is fundamentally different to what the world intuitively seems like.
But over time? Then the answer is less clear to me. Sometimes I learn things that firstly affect my world view in the abstract, then the way I personally relate to things, and finally my actions.
For example, evolution and the existence of carnivores. As I child I'd see something like a hawk tearing the wings off a little baby bird. I'd think that the hawk was very nasty and I'd want to intervene. But once I understood that this is what the hawk must do to survive, and indeed this process of weeding out the weak both keeps the sparrow population under control and helps improve their overall genetic fitness. Moreover, without trillions of similar brutal acts life would never have evolved at all. Well, with a certain level of discomfort, I can accept this baby bird getting violently killed.
Now, I'm not saying that after learning that all utility functions equal zero that I'd eventually totally change my behaviour. I don't know. But I imagine that it could effect the way I think about the world in ways that might eventually affect my behaviour.