The most dangerous country in the World is definitely the USA. If you're unfortunately live in a small country with important resources you're probably in for a ride. It doesn't even matter if you live in a democracy or not, just look up the 1953 Iranian coup d'état.
I'm not sure how much value referencing something that happened in the 1950s is to how dangerous a country is today. As an American, I don't feel as though we are the most dangerous country on the planet. We have the strongest military, and we are the world's police, but we also have the most to lose.