Its only common sense if you believe that being in government is not public services but "kukula Nyama". If only we could mobilize voters based on 'Wala Nyama" vs. "Wameza Mate" that would be the real tyranny of #'s.
What I believe in is, unfortunately, irrelevant.
Just try picturing this: Ruto in government as the DP living only on his salary of about ~1m per month and not willing to condone corruption around him (haha).
Then answer this: what are his realistic his chances of becoming PORK (or even remaining as the DP) without dishing out cash to his hombres for political (tribal) support?
In short, Jomo founded a society which demands absolute corruption from politicians to be considered "succesfull". So long as Ruto wants to remain succesfull in politics (and he does, you know), he must steal and allow to be stolen as much as is possible.
Oh, and you can freely replace Ruto's name with Uhuru, Weta, RAO, Kalonzo, etc., doesn't change a single thing. They all know what make sense.