12. Karma...reincarnation based on morality...that keeps me somewhat sane in these matters.
After I read the fascinating Egyptian Book of the Dead, it all made perfect sense. Nobody gets away with Anything. When they die, they seek their former level of moral development for rebirth...and have to come back to face the music.
That is, IMHO, the real message of Do Unto Others ... because it is highly possible the others will get many opportunities to similarly ... Do Unto You. Not out of revenge or a vengeful god ... just Cosmic Blowback.