Empirical facts can falsify moral beliefs.

I’ve usually assumed that moral beliefs cannot be disproved by empirical facts. That’s not really true. It’s true for my beiefs or those of most modern philosophers. It’s not true for belief systems which depend on empiricism. Moral beliefs with physical components. e.g: You believe that X is wrong because the world giant, who lives in a palace on the north pole, says it is wrong. You then go to the north pole and see that there is no palace. The empirical fact "the north pole is empty" changes your moral beliefs.