see, what exactly is insurance at the billionaires level.
Buddhists die in the Armageddon same as others.
The bunkers are in new Zealand which is an island and less likely to fall into chaos with the rest of the world in event of ww3 and/or moderate nuclear events.
I'm sure the bunkers are nice. Material notions got little to do with it. The bunker isn't filled with Ferraris. They are filled with food, a few copies of the internet and probably wierd sperms banks or who knows what for repopulating the earth with Altman's and Theils.