There are many governments that have been able to control a population. It's just that you might not want to live under them. Remember, China got rid of its drug users by having them all executed. Stalin killed more Soviets than Hitler. Mao did a good job against his own people also. Then there's Cambodia and many other civilizations/governments. Most people wanted to flee them not go there.The reality is that no government, no matter how well conceived and structured, can control a population that wishes to behave a certain way. They have to want to act in positive ways. This is called civilization.