I think it's an acknowledgement of human tribalism. We tend to take care of ourselves and our "family & friends" and let the rest of the world do the same, and

I think it's an acknowledgement of human tribalism. We tend to take care of ourselves and our "family & friends" and let the rest of the world do the same, and one reason why capitalism and markets work better than most alternatives, they acknowledge human nature and selfishness and don't try to delve too abstractly into moral philosophy.