Because the poor have always been surviving, since the day the were born. It's ingrained into their being. The rich don't have this instinct to survive, they're detached from it.
Anyway, it got me thinking about the rich people building bunkers in New Zealand.
I don't think they'd last very long to be honest. The farmers will be the ones to survive. The billionaire who's bought a bunker in Queenstown doesn't know how to handle their shit in the outdoors, it's not a boardroom out there. The cocky who's been walking up and down those hills all his life does. He's spent 12 hours a day out there for decades, he's probably hunted more animals than he could ever remember, he's used to being out there and handling his shit. He also probably owns a horse, which is going to go a lot further than a 4wd or a motorbike.
The survivors will survive, not the rich.