Bitcoin can't ruin a country. Not unless it was accepted as official currency in a country. but I know that it is not gonna happen. It is only a payment option in the internet to make transactions cheaper and faster(that is if its issues gets fixed in the future). Just take a look the positive side it brings, and you will see that it can help the economy to betterment. On the contrary, It is now being used by many people. and I can honestly say that it will never destroy a country. Instead, make it better.