This is false. I’ve been working on a political theory in which the political system is predicated on individualism and produces a society free of aggression of any sort. And it is a system that would produce true freedom without hardly trying, because it rejects the socialist ethic of majority rule, among other new concepts.
If government is a group of people whom have a monopoly on coercion within a jurisdiction, then if they restrict their use of coercion to stopping aggression, they do a good thing. It is possible therefore, in principle, for a government to use force and never aggress.