Uhuru's incompetence ultimately led to frustrations among the Kikuyus who seem ready to act like the guys who kill all their children and then hang themselves due to frustrations by a spouse. These agitated masses have to be appeased by such gimmicks otherwise the streets will get bloody.
Just like all such rash and reactionary strategies out of frustrations, one doesn't have the time to think of what it means to Luo and Kamba security guys or may be we will also have a security purge similar to the declared judicial purge.