There is no such thing as a perfectly defensible system. Properties that large require workers to inhabit and maintain, and the more sophisticated the property,

There is no such thing as a perfectly defensible system. Properties that large require workers to inhabit and maintain, and the more sophisticated the property, the more third party support required. The billionaire who imagines spending the apocalypse isolated away with their servants, should think about how quickly those servants would revolt, as soon as they're isolated from greater societal norms. Unless the rich want to give up the fruit of their success, the lesson holds: don't abuse those beneath you, because the position is arbitrary and incredibly susceptible to change.