That is a moral argument that isn't contained in natural selection and not supported by Darwin himself. Natural selection is also responsible for cultural evolution that produces morals that say that killing is wrong and ultimately leads to the "Golden Rule", which predates Christianity.
Wouldn’t “The Descent of Man” fill that gap?
Also cultural evolution would lead to the same tautology as natural selection: The fittest survive. Who are the fittest? Those that survive.
Culturally then, had Hitler won, then the Holocaust would be moral.
“Natural selection is also responsible for cultural evolution that produces morals that say that killing is wrong and ultimately leads to the “Golden Rule”, which predates Christianity.”
This is typical of the non-scientific speculation and hand waving that passes for “thinking” by evolutionists.
Please provide me with a reference to the specific, random genetic sequences that produced “morals that say killing is wrong.”
You or someone else concocted that one out of thin air, and because it seemed vaguely plausible and supports your grandiose “theory,” you announce it as “scientific fact.”