Where do you think morality fits into this game? It seems that we agree that underneath it all is unfathomable and ineffable magic. The question is how does this influence how you act in the game?
Ultimately, it comes down to our brain's social processing mechanisms which don't have the tools to evaluate the correctness (or lack thereof) of our moral rules. Thus many of these rules survive in a vestigial capacity though they may have served useful functions at the time they developed.