The world isn't going to die overnight, it's going to happen slowly, and it's already started. Failed crops, mass migration, water shortages, etc. The rich need to maintain the ability to influence policies like immigration to stretch out their miserable existance.

The rich think they'll live in opulent bunkers.

It doesn't seem to occur to them that they'll be killed and eaten by their own security guards, once the collapse of civilization renders their money moot.

But we will all be dead by then.