In a continent with a disproportionate number of failed states, South Africa remains a beacon of hope. (Failed States Index 2007, Foreign Policy). The neighbourhood effect remains a staunch reminder. See also the NYT with Soccer 1, Mugabe 0.
The increased vulnerability of poorly performing states reduces the ability to manage the risk of natural disasters such as floods, drought and deforestation, and, of course, the wise reinvestment of resource rents from unprecedented economic growth.