Yes, human nature will govern itself morally. Ever look around at all the nations degenerating into tribal states, where the ones with the most firepower subjugates the rest?
This reads like a call for the State to take control and your ideal society is nothing more than Communism
Just the opposite. If you believe that rules and norms which most effectively represent and advance morality and justice are products of human creativity and debate, then you will favor the classically liberal free society as the most effective means of generating such rules and norm.
If you believe that the only acceptable rules and norms are handed down from on high by a supreme authority, then you might (absent the blessing of having been socially indoctinated with liberal values) conclude that governance should be similarly structured, or that any government that proposes to implement your favored moral code is preferable to one where such matters are decided by open debate.