jeffp - In all honesty, I don't have any idea, but I would offer the suggestion that the resources of the country should be going to help the people who live there. I think you are probably right that corrupt leaders are taking the money for themselves.
          What the oil companies could do would be to quit buying off the corrupt leaders, but that would need to be brokered by somebody. If Exxon quit doing it and BP refused to, it would only hurt Exxon.

                   I guess all I can offer is, it seems like something is wrong there, I don't know how to fix it.