I'm thinking of it more as a philosophical question. I mean perhaps having a government precludes some peoples definitions of capitalism. The response would be that there will always be a biggest gang and people willing to use aggression which could interfere just as much. So according to that "pure" capitalism is inconsistent with human nature.
There have always been people who are willing to use coercion in order to force their will upon others. But that's hardly a justification for bestowing an air of legitimacy on one particular set of them and accepting their moral authority. All this does is create a society with an entrenched Stockholm syndrome of continued fealty in exchange for ever-increasing levels of parasitism and domination.