Have you tried being bad to baddies?

 Good kingship is trivially easy. So easy it's boring.

 In a Communist country, they lock up thinkers and workers. That's bad.

 In a relatively sane country, like El Salvador, they lock up criminals and the corrupt. That's good. 

 Literally that's all there is to it. Pick the guys in charge such that they persecute crime and not virtue. That's it. That's all. The fundamental theorem of governance is nearly also the final unified theorem. Be bad to baddies instead of good guys. 

 If you're really ambitious you can pray for a king who punishes liars instead of rewarding them.