Still strange how they don't systematically work to further their influence and improve community. There is place for non-violent restructuring of corrupt governments from the inside.
Why would they want to reduce corruption when it serves them so well?
Because corrupt system is ineffective system. If they have enough influence to control the system through and through, enough resources fine-tune it to serve their ends, enough involvement to subvert it, why would they put up with ineffectiveness in their system. In a way, all rulers face this battle, and tyrants seem to have easier time with it than elected leaders.