in the same way you suffer from any other kind of stampede - it's not that hard. And I do not appreciate you making light of one of the most catastrophic events of our history. the loss of life was truly horrific and the scars of that dark, dark day still live in our collective memory to this very day.
Also I have questions :-
Is your entire country underground? Because if an asteroid wipes out all of your citizens then having a capital won't really help all that much because everyone will be dead.
what if there's a fire? Or a flood? or a plague? You are all in a cave and unless it's a massive cave presumably in close quarters so if there is a plague you'll all catch it and die.
if your entire populace is wiped out, would that make you happy?