Andrew is thinking about the image of God, and the implications of denying that image on our treatment of ourselves and others.
Of course, we could always be selfishly arbitrary and declare man’s right to peaceful existence simply because we are men, and it is to our personal advantage, but there is no transcendent basis for the claim. If man is not the very image of the transcendent Being Himself, then why, praytell, should I treat my fellow man with dignity? Why should I not malign and mistreat him as I see fit?
History bears him out. Christian nations have of course committed their crimes, but they are nothing compared to the crimes of nations who deny that concept. I know that there are those who will try to pin the Nazis on the Christians, but I just don’t have time to educate everyone, if they can’t bother to educate themselves.