> But now I'm wondering if, from a utilitarian perspective, the world would have been better with him in jail.
No - he corrupted politicians. That is how it works in most African countries - give a lot of money to politicians in exchange for protection from any legal problems.
This regularly happens in the country to its south and in Zimbabwe (e.g. John Bredenkamp).
Do you really believe that he would "make things better"? He probably greased a lot of palms to ensure that he is not extradited to the US.
He will continue greasing palms (with stolen money) and start again with his corruption. There are numerous examples of this being the case.
A good example is Jurgen Harksen. He was on the run from German authorities and decided to hid in South Africa. He quickly started on the corruption bandwagon again and formed close "relationships" with various politicians.
No - he corrupted politicians. That is how it works in most African countries - give a lot of money to politicians in exchange for protection from any legal problems.
This regularly happens in the country to its south and in Zimbabwe (e.g. John Bredenkamp).