> People who are wealthy enough to move anywhere in the world (including to a military-grade bunker somewhere remote like New Zealand) if their current domicile is negatively affected don't have as strong of an incentive to maintain peace.

Eh, if you’re a billionaire factory owner and landlord, the kind of war that would send you to a military grade bunker in New Zealand will be bad for your factories, properties, workers and tenants.

Also, a man can only go to the opera if the singers and orchestra aren’t busy scavenging for food or fighting mutant wolves. And the same is true of most other entertainment, fine dining, fashion and suchlike.

Sane wealthy people gain nothing from a world scale war, and in fact would face a big loss in quality of life.