I guess maybe I'm just a bit put off because of the blurb towards the opening about "society A, which is filled with evil, ignorant savages who live under anarchy" (conveniently not naming any specific society, but hint hint, it reads a lot like the author implies either Somalia or Colombia). I thought we were past the whole racist Noble Savage thing.
This is pretty much even sillier hypothesis than "if people agree to work together towards common good, through the forces of cooperation, they would achieve prosperity greater than it's possible in any competitive capitalist system" and that one was tried and proven false.
People agreeing that the violence is not the right way to resolve disputes? Author must somehow missed all of history right untill yesterday and have no friends or at least only friends without neighbours.
... which seems rather weak to me.
So basically everyone should be armed to their teeth? Because, if there is no state to impose control, a warlord will emerge who will. Or is there some other solution to the problem that humans have known tendencies toward violence and power hunger?