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?
Traditional notions of morality are confused, and observation of the way people act does show that they are poor explanations, so I think we are in perfect agreement there. (I do mean "notion" among thinkers, not among average people who haven't given much though to such things.) Your second paragraph isn't in conflict with my statement that morality is traditionally understood to be in some sense objectively true and objectively binding on us, and that it would be just as true and just as binding if we had evolved very differently.
It's a different topic altogether to consider to whom we have moral obligations (or who should be treated in ways constrained by our morality). And it's another topic again to consider what types of beings are able to participate (or are obligated to participate in) the moral system. I wasn't touching on either of these last two topics.
All I'm saying is that I believe that what morality actually is for each of us in our daily lives is a result of what worked for our ancestors, and that is all it is. I.e., there is no objective morality and there is no ONE TRUE WAY. You can never say "reason demands that you must do ..." or "you are morally obligated by reality itself to ..." without first making some assumptions that are themselves not justifiable (the axioms that we have as a result of evolution). Anything you build on that foundational bedrock is contingent and not necessary.