I don't think there's much difference between the writing in news articles and the spoken language. Great care is given in English to the language style of news so that most people can understand it. There are of course, more in depth, academic, scientific, economic news sources that have a more specialized language.
As far as turmoil, this is actually a common word! It <em>could</em> be replaced by some of the words you listed, but when I read that sentence, I don't question the word choice, it seems natural. Crisis is perhaps the best substitute. Confusion is more of a personal state. Trouble is perhaps not strong enough, as if turning around and straightening the course is still an option. Commotion is more of a quick burst of activity. Disorder, although a synonym of turmoil, is in my opinion, not a good choice for describing a governmental problem....I don't know if I can explain why, it just <em>feels</em> odd!
These are just my opinions! Keep reading, and nice post!