That world is long gone. And impossible to define objectively. What's the smallest leanest monopoly of violence that keeps the peace so that the most ambitious

That world is long gone. And impossible to define objectively. What's the smallest leanest monopoly of violence that keeps the peace so that the most ambitious peoples' journies help deliver the greatest standard of living increases for the most amount of people while also preventing human rights violations and atrocities? If the govt wasn't meant to do that, then we still have those problems and I don't see any interest in any individual to solve it.