It’s also hard to write non-fiction about a complicated plural republic. Which means we vastly under-estimate the savage complexity of all of humanity’s means of coordination.
There's also the fiction problem. We have an awful lot of science fiction and fantasy about empire, because empire is easy to write about. The power is in the hands of a few characters. It's very big, but it's also very dramatic. It's much harder to write fiction about a complicated plural republic with 52 interlaced political offices and everybody coming from complicated, slightly middle-class backgrounds. Just try writing fiction about the European Union and you will figure this out. So when people look back to history dominated by technology, and forward to futures dominated by technology, they're seeing a lot of models of empire.