When two reference points that contradict each other both say they are the measure that something should be done by, logically one is not true since they contradict.
Not necessarily.
How so?
Good = Eat your neighbour
Good = Do not eat your neighbour
Good is a fundamentally subjective concept.
Is it?
Basically, you have said "good" is a preference. What makes it good then? I like ice-cream. Ice-cream is good! You should like ice-cream too.
What I believe you are confusing is subjective feelings with ethics/morality. You confuse what is the case - I like ice-cream, with what ought to be the case. You are also confusing two different things, goodness with preference. My subjective feelings do not make something good unless it is good, no matter what I believe about goodness. The example regarding ice-cream confuses subjective TASTE with what ought to be.
Goodness has to have a fixed reference point to know what goodness is or else you cannot say something is better than something else. Better in relation to what? Your subjective feelings? The feelings that you and those like-minded like? Subsequently, there must be a best to compare it with or else the standard is always in flux.
Good for Aztec warrior = Eat your neighboring tribe members AMONG A GREAT MANY OTHER SUBJECTIVELY GOOD THINGS.
Good, or what they enjoyed?
Good, okay, you're next! You see, your worldview becomes inconsistent when it fails the experiential test. Sure, you can think it but can you live it?
And if what you say is the case, preference, what is wrong with Hitler's Germany? That was good for Hitler and the German culture (via propaganda). Why should I believe your view is any better if better is a changing standard based on subjective preference? What about my preference that is the opposite of yours? Why is that not right? Obviously, good is an identity. Logically it can't be two contradictory things at the same time. Either killing the unborn one minute before birth is good or it is not good. It can't be both at the same time.
Eating your neighboring tribe members is not the definition of GOOD.
GOOD is a subjective property-of (Qualia) objects and or actions.
You are confusing qualitative with quantitative. They are two different measuring systems. One is physical, the other is intangible. David Hume argued you can't get an "ought" from an "is." That is the is/ought fallacy. Just because someone likes something does not make it good. It just makes it liked.
If one of these two propositions is true the other cannot be true for they both say contrary things regarding the same thing - Good, and what that means. Sometimes, depending on the two propositions, it is possible that both are wrong, but both cannot be right when they state opposites.
Neither statement can be determined to be tautologically REAL-TRUE-FACT (or even bear any truth-value whatsoever) unless you make your definitions (specifically of the word "GOOD") rigorous and explicit.
I did. Good = good. Good =/= (does not equal) bad or evil. They are contrary to each other.
Dog = dog.
Dog = cat.
One of these two statements is wrong. Both cannot be right.
You appear to be suggesting,
A = A
A =/= B
No, what I am saying is that if you identify what we call the word "dog" as a specific four-footed animal it can't be another type of animal and still make sense. It loses its identity. Thus calling something a dog fits a specific kind of animal. It can't be a different type of animal and still be a dog. Logically that is not possible because it speaks of two different animals, not the same kind of animal. It is a contradiction to call a dog a cat, yet relativism employs this kind of reasoning with goodness.
Woe to those who call evil good, and good evil; Who substitute darkness for light and light for darkness; Who substitute bitter for sweet and sweet for bitter!
Even what some on these forums call "primitive goat-tribes" understood a principle that modern humanity is finding difficult to understand.
It either IS the case or it is NOT the case. It cannot both be the case and not the case at the same time.
Certainly, but your second example does absolutely nothing to inform your first example.
You have committed a category error (non-sequitur/conflated opinion with fact).
You've basically asserted,
(IFF) 1 + 1 = 2 (THEN) I love you.
No, I have not. You asserted that (IFF) 1+1 = 2 (THEN) I love you. I never mentioned (IFF) 1+1 = 2 (THEN) I love you. That is not my point.
My inference has to do with the law of identity, although I did not state it specifically, in regards to logic.
"It either IS the case or it is NOT the case. It cannot both be the case and not the case at the same time."
It either is the case that a dog is a dog or it is not the case, but once the law of identity is jettisoned, a dog can be a cat which makes no sense because it has a different identity and is contrary to what it actually is. Thus, Dog = Cat is contrary to Dog = Dog. It can't be both because it loses its identity, yet that is what happens with subjectivism and how different people define "good" or "right."
Dog = Dog --> law of identity
Dog = Cat --> contrary to the law of identity.