Morality is like a religion

[robvalue]

One last try If I'm understanding you correctly:

What you have created is correct, but it is a logical tautology (always true regardless). It's nothing to do with science, or the subject matter in fact. Let me explain:

Say we have a person X. We find out their capacity for having "positive feelings" with F(X) and their ability to live a "worthwhile life" as L(X). They both return a Y or a N.

You have stated that L(X) = Y if and only if F(X) = Y. So, in fact, F(X) = L(X) for any person X. You get the same answer, yes or no, for both questions for any given person.

Your proposal is now:

"If a person has no positive feelings, they can't live a worthwhile life."

If F(X) = N then L(X) = N

But since F(X) = L(X), it becomes

If F(X) = N then F(X) = N

So this is correct, but it is a tautology. If you have no positive feelings, you have no positive feelings. This logic is also true for any F and L that I define in the same way. F could be "Do I have a green car" and L could be "Am I trendy?" and I say F = L . Then I get the same result. The fact that F happens to be talking about feeling is irrelevant. The above example reduces to if I don't have a green car, I don't have a green car.

So hopefully you see my problem! You're just stating something that must logically be true, by definition. Which is fine, but it doesn't demonstrate anything else.