Perhaps we do not realize this but calamities are generally a warning from God. When nations exceed the limits set by God they invite His wrath and hence destruction.
If we review our nation as muslims there is not one sin we do not commit and if we refer to the Quraan it is distinctly mentioned thay many a popoulations were overturned and destroyed just because of one sin. Take the example of Prophet Lot, Prophet Noah, Prophet Moses. We have been given distinct examples where the tyranny of the rulers has led to immense and total destructions. Its about time that our rulers remember the examples and review themselves or we just need to unite as a nation and over throw them implementing the basic principals refraining from self imposed conflicts.