Peter Holmes wrote: ↑Tue Nov 08, 2022 9:57 pm
Here's a definition of 'premise': a previous statement or proposition from which another is inferred or follows as a conclusion.
Notice, there's no requirement that a premise be true, or even have a truth-value at all. A premise is just a declarative sentence - an assertion with the general form: X is/was the case. So there can be moral premises from which moral conclusions follow.
That's only speaking of the logical form of an argument, Peter. And you are quite right about that. We call an argument with the correct form, "formally valid." But you're also right: we don't necessarily call it "true." There are false arguments that are formally valid.
As you also rightly say, an argument that is both valid and truthful is called "sound." And only sound arguments have implications for the real world. Merely "valid" arguments that are false have none: they're merely formally elegant but devoid of truth value. And false arguments, of course, have no binding implications for the real world because they get the facts wrong.
But then your conclusion, after all this, has to be not that there are merely moral premises that can form part of a valid (but false) argument (which is a trivial thing to say, since ANY subject matter can form a premise in a formally valid argument that's false), but rather that there are simply no true premises that can depend on moral premises. For all moral premises are false.
That means we don't need to do any moral thinking at all, and any attempt to invoke a moral claim is simply an attempt to deceive, through the specious generating of formally-valid-but-factually-false arguments.
Is that how you think it is?
And that's why disagreement about important moral issues is rational.
Non-sequitur. That does not follow.
If all arguments about morality are factually false, then the arguments you generate about them become formal-logical, but not rational tio generate (i.e. valid, but not sound, and not relevant to the real world). Replace the word "morals" with the word "unicorns," and you'll get exactly the same thing: arguments that are perhaps formally valid, but entail nothing in the real world.
Only unicorns have two tails.
This horse-creature has two tails.
This is a unicorn.
Formally valid, factually false. There are no unicorns. They don't have any tails at all, let alone two. They are mythical only.
Again, I have to ask: is this what morality is to you?
But if it is, what is the value of making any moral premise? None can be true, so there can no longer be any rational moral arguments. They turn out to be as stupid as arguing about how many tails unicorns have. They're arguments about nothing: and no matter how formally elegant, they add up to nothing legit.