RV - Kihara is just doing his job. Policy of Uhuru Government is called out and driven by State House operatives the Nancy Gitaus, Nzioka Waitas , Njee Muturis ,Ruth Kagias ,Kinuthia Mbuguas , The other wing of Harambee house the Matiangis and Kibicho co-ordinate and execute the policy .
Same as the Operatives managed edge out Ruto from Participating in policy making , these guys have their main man in State Law Office Ken Ogetto doing their bid (Do you remember the wars of Njee and former AG Githu Muigai ?. You very well know Uhuru and his team discern Judiciary it caused alot of headaches in their first term , Its very evident 2nd term they decided for them to operate effectively is to take the impunity way .
Now your suggestion below of Kihara to resign is akin to saying Ruto should also resign , which is arguable if looked at from different angles .
Further take example of Wako under Moi , I bet he can be graded as master of impunity and a supporter of dictatorship . Now Look at the same Wako under Kibaki , a very different AG .