Failures of development programs for Africa led to the opinion that tens of billions of dollars are just wasted. This belief is very comfortable to the small-government types. The evidences seemingly prove something about ineffective governments. The favorite ideological conclusion predicts that the private sector would eradicate poverty if foreign governments reduced their involvement in Africa.
But the private sector was there for the last 10,000 years. It didn't succeed at all. And there's no reason to expect anything else. The history of economic development is the history of governments building suitable conditions for the private sector to work. In fact, we have stories of economic growth without private sector (the Soviet Union's output more than quadrupled in 1917–1991) and no stories of growth under small government.
The private sector is necessary but not sufficient for improving Africa's performance. Free markets degenerate into monopolies once some market participant gets ready to capture political power. Monopolists select the government. This clientelist government serves the interest of the few, and under some mutations appear as single-party dictatorships or oligarchies. Latin America's past is full of these examples.
The worst enemy of the private enterprise is businesspeople who say that they'd be better off without the government. Maybe some of them will, but at the expense of private businesses in general. Kinda class enemy within.
Economic development consists of building constructive state capacity that ensures sustainable competition and certain public goods, such as education. And here billions spent on Africa by international donors make sense. International programs improved over the last fifty years. They also helped understand development at large. Very few now agree that buying lots of machinery is enough to create sustainable growth.
This expertise is valuable, but societies need more of it. This is why foreign aid to developing regions should be larger, not smaller. Many efforts are more effective there, than in Western Europe or North America. Providing right medications in Africa can save a human life at the cost of a movie ticket in California. In these cases, the best idea is not to reduce development efforts, but to make them more responsive to new evidences.