I just don't understand the logic. Do people really think they can isolate themselves in a huge personal vault, probably with 10-20 servants and their families who are needed to run the thing? What's the endgame? What kind of society would they build there? How fast would this little monarchy fall apart? Not to speak of how such a compound would be a glowing target for the population of the island, but maybe scavengers who possess boats or aircraft. The Expanse series had an episode that showcased this when Earth was hit with a meteorite.