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.

A leopard does not magically change its spots.