I realize that and my post was not meant in any way to imply otherwise. It was more meant to illustrate that just because someone does not base their moral system in religious beliefs does not mean that they are incapable being just as trustworthy and moral as anyone who does.
I'm not sure, but isn't the basic "Prisoner's Dilemma" approach of "tit for tat" a reasonable appoach to both your formulation and the Golden rule?