The whole point of invoking an ideal rational agent in the first place was to demonstrate that moral “truths” aren’t like empirical or mathematical truths in that you can’t discover them objectively through philosophy or mathematics (even if you are infinitely smart). Rather, moral “truths” are peculiar to humans.
If you want to illustrate the non-objectivity of morality, then stating that even ideal rational agents won’t converge on them is one of expressing the point, although it helps to state the “ideal” explicitly. However, that is still only the expression of a claim, not the “demonstration” of one.
I did mean ideally rational.
The whole point of invoking an ideal rational agent in the first place was to demonstrate that moral “truths” aren’t like empirical or mathematical truths in that you can’t discover them objectively through philosophy or mathematics (even if you are infinitely smart). Rather, moral “truths” are peculiar to humans.
If you want to illustrate the non-objectivity of morality, then stating that even ideal rational agents won’t converge on them is one of expressing the point, although it helps to state the “ideal” explicitly. However, that is still only the expression of a claim, not the “demonstration” of one.