That's funny.
So, in your scenario, when the 'moderates' have killed all the 'hotheads', and the only ones left are those like yourself with no basis in God-given law, on what are you going to base your new set of rules for mankind to live by?
Are you going to make it up on the spot? There were several societies who tried that unsuccessfully in the last century...in fact, they did it EXACTLY as you are proposing...the most notorious was known as the Soviet Union.