Patur Aval Assur,
You are saying either that there is value, or that even though there is no value one should still refrain from killing (I’m not sure which one you are saying).
I’m saying there is value – although there is no guarantee that a human can see or understand that value.
or else carefully delineate what the value is, which I feel you have not done as of yet.
This is an unreasonable constraint, and is why I previously said that your conundrum was artificial.
I agree with you that both human beings and animals would only want to do things that are valuable. The difference between them is that animals are capable of seeing an action as valuable only if they understand what the value is for them (your demand). This is why I keep relating your arguments to the animal perspective. Humans, on the other hand, do not have this constraint. Hashem can tell us that an act has value, and we can believe Him and do it, even if we have no understanding of what the value is.