Armageddon is what will happen when billionaires, or even trillionaires, are given free rein. Could this be the final outcome of late-stage American capitalism and democracy? Imagine a human-extinction event: a rogue artificial intelligence (AI) revolution, a new world war or runaway climate change. You likely already have a fair idea of where the safest places on earth and beyond are, if you have been following the ultra-wealthy individuals from Silicon Valley and Wall Street. They are building...