I think I'd take issue with this, though - from Dancing in the Glory of Monsters: The Collapse of the Congo and the Great War of Africa, by Jason Stearns (Public Affairs, 2011), Kindle Loc. 130-146:
The Democratic Republic of the Congo is a vast country, the size of western Europe and home to sixty million people. For decades it was known for its rich geology, which includes large reserves of cobalt, copper, and diamonds, and for the extravagance of its dictator Mobutu Sese Seko, but not for violence or depravity.
As I understood the history, it was only when Mobutu pretty much cornered the market in violence that the Congo was peaceful. In the period between independence and military coup, it was the basket-case it's been ever since.