This all works until the population gets to a certain size. I'm thinking that it is the size of the group that influences whether or not it can operate with some degree of functioning anarchy. Also, any group within the borders of the US is also operating under the "capitalistic umbrella" provided by the remainder of the nation which isn't anarchistic. The non-anarchistic members of the larger society seem to tolerate rather than appreciate anarchy from what I can see.
The increase in population is made possible by increased division of labor, domestication, sedentism, and agriculture, and is amplified by industrialization, modern medicine, chemical fertilizers, commercial fishing, and as always, the process of colonization and dislocation/genocide. I know you didn't specify what you feel that "certain size" to be, but well before we see the emergence of cities, mass society, or globalization, we see the origins of private property, raids, warfare, patriarchy, institutionalized hierarchy, increasing specialization leading to increased reliance on experts and rulers, class society, the erosion of community, and other trends antagonistic to anarchy.
Mass society is not the cause, but a consequence of the authoritarian trajectory set already in place in these earlier stages of domestication and civilization.
Obviously, despite our evolutionary and cultural heritage of egalitarianism, we are posterity to 11,000 years of collective trauma and systemic violence. Before we conceptualized anarchy and wildness, we lived it. Most people aren't familiar with the ideas and history of anarchism, but regardless of the fact, even the most tyrannical members of our culture love, break laws, become corrupt, share food, value freedom (if only their own). We aren't a hierarchical species; we live in a hierarchical culture, which socially and economically rewards upward mobility at others' expense, whether we're talking at the individual, demographic, class, or cultural level.
I don't see the state, corporations, or the dominant culture tolerating those actively and effectively resisting colonialism and oppression. I see dislocations, assaults, murders, federal harassment, subpoenas, jail and prison time, and ecocide. I do see tolerance where I see ineffectiveness, assimilation, and commodified subcultures, but then, it's easy to adopt a label, stance, or identity, or engage in ritualized demonstrations, join organizations, sign petitions, and the rest of what less and less often passes for resistance; particularly in first-world countries.