“Certainly, we can be…
“Certainly, we can be more confident about natural facts than moral ones.”
I don’t agree that this is “certain,” at least not categorically. For example, it is a moral fact that it’s wrong to pour gasoline over a cat and light it on fire, just for the fun of watching it burn. It seems to be a natural fact, as far as we know, that the Universe is expanding, and that the further away a galaxy is from us, the faster it is moving away from us. I’m pretty confident of both facts, but I’m far more confident of the fact that it’s wrong to burn cats alive just for the fun of it than I am of the fact that the Universe is expanding. (In fact, I think that if anyone reposes less cofidence in certain moral facts, such as the fact that burning cats alive for the fun of it is wrong, than they do in empirical discoveries, then that itself may be a form of moral vice…)