In a political science course I heard the argument that "violence" is a natural monopoly, in the sense that in the absence of a state, some other gangster group will come in to fill the vacuum.
I then thought a similar argument could be made about propaganda. It seems to be true there will always be some variation in political ability/ability to persuade and propagandize others. Won't this mean that even if you created an anarchist society, it would eventually be taken over? Is there an instability argument to be made here?