As a matter of fact, the African Union itself estimated that every year corruption alone costs Africa $148 billion. If African leaders could cut that in half, they'll find more money than what Tony Blair is trying to raise for them.
Leadership is about having principles. A leader must have a vision and principles that will endure for all time and must always be true to these principles, applying them to changing circumstances
The true leader is a different sort; he seeks effective activity which has a truly beneficient purpose. He inspires others to follow in his wake, and holding aloft the torch of wisdom, leads the way for society to realize its genuinely great aspirations.
Likewise the leader of any state has to do the same, he has to enforce Shariah firmly, for he will be held in account later in the afterlife if he fails.