I get your idea and I am in agreement with it, though I would like to correct you regarding your claim that only "some countries" experience calamities. For all I care the whole world experiences disasters, no one place safer than the other. It's just a matter of timing.
Still, there are places on Earth where natural disasters occur more often and with larger consequences, which pose a greater danger to the population than other places. The strength of bitcoin in its current form is decentralization, and the more decentralized the network, the more resilient the system is to various natural disasters. We can talk a lot about the financial and political dangers for bitcoin, but the technical issues are not so important at this point in time.