Actually the "holy roman empire" (the western version) was for a long time an elected body even though it supported slavery. Republicanism and democracy are both electorial forms, but republicanism doesn't conflict with either aristocracy or monarchy. The roman emperors I believe were actually elected by the military. Nothing says the votes in an alternate UN are democratic, indeed when monarchies are voting (such as saudi arabia) you could say that it isn't a democratic institute at all.
As for saying that such things are the enemies of literate reason, well you have only to look to such literate societies as the 13nth century ottoman empire, the greek city states (the slave state of sparta for instance) the empire of Alexander, and especially the Empire of China which invented such things as gunpowder and the compass (and which even today is NOT exactly a democracy as it looks to become a world power again).
I really hate it when people think our modern way is the only way, or even the only "good" way for people to live. Freedom of choice also means accepting when people decide to live in a different kind of society, otherwise we have no real freedom at all.
Very educated people can find positives to say about things like aristocracy, or theocracy. You could say that aristocracy (for example) vests those with power into the land and prevents the most rampant abuses to the environment (if your children and grandchildren are going to be getting their wealth from the same piece of property you plan ahead and take care of it), theocracy could be said to promote the humanities and family values, plus societal traditions, a lack of womans sufferage could be said to promote lower prices (no two family incomes) and better child rearing (one parent always at home). Educated people know that each of these decisions have their pros and cons. Not that they are a godsend, but they aren't necessarally the source of barbarism and enemy of education either.
Ok off my rant against the narrowminded and uneducated . . . lol. The point is an elective body like the U.N could very easilly represent a world republic where all the voters are monarchs, emperors, god-kings, etc . . . And adopting values our current world doesn't share is just alternate history, not a contradiction of what the body MUST stand for.