"Le Guin has a point. Obviously, we have no idea how relative..." — David Graeber quote meaning

Le Guin has a point. Obviously, we have no idea how relatively happy the inhabitants of Ukrainian mega-sites like Maidenetske or Nebelivka were, compared to the lords who constructed kurgan burials, or even the retainers ritually sacrificed at their funerals; or the bonded labourers who provided wheat and barley to the inhabitants of later Greek colonies along the Black Sea coast (though we can guess), and as anyone who has read the story knows, Omelas had some problems too. But the point remains: why do we assume that people who have figured out a way for a large population to govern and support itself without temples, palaces and military fortifications – that is, without overt displays of arrogance, self-abasement and cruelty – are somehow less complex than those who have not?