... selfishness in our society has a negative connotation; it is inherently anti-social, and therefore undesirable for any society, large or small.
begs the question; assumes a prior moral obligation not to be selfish, anti-social, or to act in ways undesirable to any society
Being selfish is simply an antisocial phenomenon. No society to my knowledge promotes selfishness.
... Their twisted religious beliefs tell them it is morally right to do that!
"Twisted" assumes a prior prescriptive moral obligation for fathers not to kill to kill their wives and daughters. Begs the question in that morality can't be accounted for by positing a prior moral rule. Vitiates the claim that morality is relative.
Killing your own kind is counterproductive. No society promotes murder as something beneficial. Muslim "mercy" killings are also in conflict with our societal values.
A natural man is really not human as we think of humans, but only if he is properly civilized, that is—brought up, taught, trained to be a domesticated beast.
Assumes the very thing in question; a purpose or an established standard for which the natural man is appropriately fitted.
Properly civilized according to each cultural standard. No assumption there.
Your descriptive observation misses the point. Morality is prescriptive. Why shouldn't be a person be selfish?
Killing your own kind is counterproductive. No society promotes murder as something beneficial. Muslim "mercy" killings are also in conflict with our societal values.
So what? Societies values are relative. And why should a person care about being productive? (fact check - I think some societies have promoted killing of one's own kind in some instances, but it's besides the point)
Properly civilized according to each cultural standard. No assumption there.
Ok. But is there moral incumbency for a person to be "properly civilized" according to each cultural standard?
Cordially,
What is it that makes a phenomenon "antisocial?"
What does the word "good" mean to you? For that matter, what does the word "evil" mean to you?