Prosperous and internally peaceful Islamic nations are all brutal police states where the slightest criminality or non-compliance with the state is met with severe punishment.

They also heavily police Islam itself, taking a serious approach to monitoring and regulating the branches of Islam that exist in their territories. Muslim rulers do this because THEY KNOW, that even in prosperous, peaceful nations at the best of times, their own religion is powder keg waiting to go off - because that's exactly what Mohammed designed it to be.