2 solutions.
A cult of virtue. A monastic tradition where virtue is cultivated intensely and scarily. Put them in charge.
An immortal group mind. A dozen or a hundred people, chipped and networked. Totally mindmelded. Such vast Intelligence and perspective, virtue would be unavoidable. Put that thing in charge.
Cant's solve narrative distortion with another sci-fi satire narrative. Solve the words or go extinct.
Well they're semiplausible
The idea is just ancient hierarchy reimposed in a decentralized, horizontalized info grid. About as plausible as Santa Claus becoming ruler.