I'm not sure if you are trying to make a joke here, but I'll respond in earnest anyway.
The benevolent dictator model works in open-source projects because the power of the dictator is still limited by the willingness of the governed to participate in the project. This forces the "benevolent" part. Developers can always stop contributing, fork, or start up a new project.
This isn't the case with governments. Unchecked power ends up corrupting the ones holding the power in the majority of cases even if they start to govern with the aim to be benevolent. And you cannot stop contributing, fork or rewrite a society. Most dictatorships also try very hard to prevent their subjects from leaving their domain, because not participating and contributing is the ultimate act of disobedience.
