[Diamond]

How do you get to "selfish" from "promoting group survival?"

I asked why I should (morally) be concerned with the survival of the group and I was told, because without the group my chances of survival go way down. So I guess the reasoning is that if I'm selfish it hurts the group and if the groups don't survive, then the species doesn't survive and if the species dies out, then I will not survive. While that does have practical value it doesn't explain morality. What is the source of the moral rule that I ought to be unselfish? Saying that because it is better for me and mine somehow just doesn't sound like a justification of the moral rule that I should be unselfish.

Cordially,

[Junior]

What is the source of the moral rule that I ought to be unselfish? Saying that because it is better for me and mine somehow just doesn't sound like a justification of the moral rule that I should be unselfish.

Not a justification, but a source, as it were. This trait has been selected for for millennia.

[js1138]

What is the source of the moral rule that I ought to be unselfish?

Being selfish or unselfish is a personality trait, not a moral rule.