This doesn't prove the existence of "goodness"; all that it demonstrates is that you have been socially conditioned to categorize behavior and circumstances according to a particular moral construct.
But you would have to be a materialist to view things that way. Socially Conditioned - Implies that a person learned from society what is good and evil. This comes from observation. Why did you believe what you observed? Just because you believe what you observed, could you also believe what you do not observe?
Is all moral philosophy a derivative of societal conditioning, or is there moral philosophy apart from all conditioning?
So, no, I reject what you say, because the unseen assumptions behind it are wrong. We can't determine things on materialist philosophy (observation only) because observation is only one piece of reality. Materialism itself opposes strict materialism, because to believe materialism, a person must first believe in observation itself... which is a philosophy believed but not seen. "Observation is true".
And it sucks I have to go that far down the rabbit hole to disagree with you, but basically, I agree to a certain extent. The Bible teaches that men and women learn good and evil from society. Yet what the Bible also teaches is that there is a moral law which exists apart from what men teach, and this moral law never changes.
Yet a person must step apart from society and go find that moral law to realize it is there. If they go by observation only, they will easily conclude as you have, it was just learned. But as I said, there is no reason to believe observation at all without first positing an aspect of this moral philosophy you are arguing against. To say, "Observation is true" is to then say something is true apart from what society teaches. Yet, why is that given statement intrinsically true vs. other statements? Like, "Observation is not true." Or various other statements, and I am somewhere in the middle on that issue, not strictly in either camp.
But this is just a logical fallacy. Sickness in biological organisms is not a morally categorizable circumstance; it is merely a fact of biology. To be sick, or to die, is ultimately to occupy one of an infinite number of biological states that are possible within the contingency of the universe. But to assign moral value to any particular state is to completely misunderstand the nature of "good" and "evil".
Biology arose from God's word, and God's word opposes sickness and disease. In the future, those things will be done away with, and will not exist by God's elimination of evil.
They are evil not by a moral philosophy which is derived from biology.
They are evil by the philosophy which created biology itself. This philosophy is higher than biological knowledge because it created biological knowledge.