How is it not an argument for my position? My position is that morality is subjective, axiomatic, and faith-based. That's why different societies can develop different moralities.
There is no empirical value for human life, the way there is for the speed of light. Each society, each individual can come up with their own arbitrary value for human life, whenever they want. A sociopath who refrains from killing not because he values other lives but because he only values his own isn't morally inferior to the abortion abolitionist who values human life even in zygote form isn't morally inferior to the pacifist who values human life so much that he'll let others commit mass murder rather than use even an infinitesimal amount of force to try to stop them. And none of those is morally inferior to you, because there is no absolute, objective morality.
Empiricism can't generate moral values. Only faith can do that. Whether it's faith in the traditions handed down by your ancestors, faith in your own personal authority to decide right and wrong for yourself, faith in something else, or some combination.