My friend created this world that's exactly like the real world, except with a new nation occupying Greenland. He made it so that the nation is ran by a "communistic oligarchy" where a small group (1000 or so) people called "the Grey" gather pretty much the entirety of political power and share a common pool of money and resources, including weapons and automated combatants (in case human soldiers are too hard to control).
When I asked him what keeps the oligarchy from splitting into small subgroups that try to seize complete, dictatorial control, he just said that the oligarchy practice some austere religion and only take members from the practitioners of that religion, which means the Grey are all ideologically processed to have no motivation of seizing power.
I don't see how the system he set up isn't going to be infiltrated by people who just want power and passed the religion exam, or how a small group of ideological extremists can monitor one another's ideology, not to mention that a nation controlled by an explicitly oligarchical group of rulers may not be possible in the first place.
I suspect that extreme ideology is just a lazy explanation for complex human behavior not explicable otherwise. So I am interested to know if this kind of hand-wave had appeared elsewhere in works of fiction and whether or not it is inherently deleterious to the quality of a fictional world.