The hawkers are being allowed into the city because of the plan to start so-called "BRT" bus services in Nairobi. The consequence will be loss of employment among Kikuyu youths. This group is now being given an alternative opportunity to hawk freely within the city!! (aka Kikuyu privilege!)
Now if it were, for example maize or sugar farmers, they'd be told that their practices are inefficient/archaic and must look for other opportunities or else perish!