--- Like you say, just Ask Adolph Hitler, Mao Tse Tung, or Pol Pot. In general, they tried to impose moral systems that prohibited our freedom to pursue our rational self interest and succeed. Thats without precedent in nature, cant work. So they failed. ---
I disagree with you.
The concept of a totalitarian organization of beings is not without precedent. Take the honey bee for example.
It didn't work because human beings are not honey bees. God created us with free will. It is that free will that defies such organizational structures and leads to failure of such systems.
I realize that we can both rationalize whatever answer we want. God will sort it out for us though. :)
Those regimes were fascist as well, which would be like forcing bees to work for the queen.
I figuratively agree with the rest of your post though. Let God sort out which explanation is more a rationalization. Regards.