This book is bread and butter in terms of its mythic value. It's pretty standard as a picture of injustice, but that does not mean it isn't of unique value. Its value comes from the elegance of the picture it provides. Instead of burying the reader in information, the novel paints a fairly simplistic picture that, if taken seriously, could reveal things to the reader about their own mind, their own civilization, or their own relationship to power.
The question is simply, how seriously should the reader take the imagery? To take the story to its ultimate seriousness would be to ask, "What if it were me in the story?" The best answer to that question might be, "It is me in the story."
Instead of taking the setting and detail of the story literally, the reader could view the plot as a portrait of their own self. Whenever a person seeks power over others, they are being the tyrant. Whenever people hide away in private, lonely castles and pretend to be better than other people, they're being the tyrant again. But, if a person seeks to unify their community to pursue justice and freedom, then they're being the town people.
But the truth is that we are all the tyrant in some situations and in other situations, we're the disenfranchised, mistreated people. In the end, it is better to unify with our communities and fight for justice, than it is to have power and misuse it.
