—“so yes, science can tell us what is but not what we ought to do.”—
This is a justificationary position (sophism).
|Decidability| = That which is not irreciprocal or false (negatively consequential) -> Value (personal strategy -> Positively Consequential) -> Preference (Inconsequential)
Science (law) tells us what we may not do (irreciprocity) – that which is unethical, and immoral. Anything that is not unethical and immoral is merely a PREFERENCE to be settled in the market competition for means and ends.
What we ‘ought’ to do is anything we CAN organize voluntarily TO DO that which is not false or irreciprocal.
Even so, we can just as equally test positive moral claims by the investments that you make, the externalities caused, and desired outcomes produced.
All truth propositions are falsificationary.
All moral claims are merely claims that one acts not immorally.
All moral propositions, means, and outcomes are testable by reciprocity.
All moral propositions are open to triangulation of the returns on investments (compare by ordinality if not cardinality).
All moral propositions are decidable by adversarial competition in markets for voluntary production of moral outcomes, given scarcity and competition for means and outcomes.
All markets produce empirical results, and as such are scientific. All epistemological questions are the result of falsification by adversarial competition. All moral questions are epistemological questions.
All not-evil-immoral-unethical propositions are amoral, ethical, or good, depending upon the means of organizing their production, the structure of their production, and the returns on that production.
We can make a claim to means, externalities, or ends, or all three. We can measure the claim, the means, the ends – all three, and do so scientifically.
There is nothing in metaphysics, language, psychology, or sociology that cannot be expressed scientifically in these terms.
That is a purely scientific statement. Conversely you cannot deny or falsify this statement.
If you don’t use these terms one can claim ignorance, on can claim expediency(cost), but one cannot claim anything else.
As far as I know, The question of Morality is closed.
You can try to create test after test but you will find no test that fails this test.