Poor okuyu. This looks like drugs - the suspect is a college kid.
The occult angle is bizarre as Kikuyu are not known for that. Could be mental. By 2013 the kid was how old - 16? that when he reported the mom for witchcraft.
Anyway the more I see here is anyi-Kikuyu bigotry disguised as debate. Luo for instance have similar stories of empty upcountry mansions due to witchcraft and curses from envious relatives. Kamba the same. Kisii and Mijikenda are constantly in the news for witch-hunting... literally Salem horrors playing out in the 21st century. Meru are still FGM'ing their girls en masse along with many others. Plain old human troubles.
Njuri's beef with Kikuyu is similar to old Omollo's: he deems them unfairly lucky and this seems to be sufficient proof of their summary delinquency. While I'm not fully sold on the entrepreneurial and other merits of the Kikuyu (I view them as political scavengers), they do just fine for themselves and are arguably the most socioeconomically vibrant tribe in Kenya.
"Luo is a lifestyle, Kikuyu is an enterprise"
Njuri take a deep breath. Meru will remain a miscellaneous Kikuyu appendage for a long time politically speaking. This is a good thing due to the big goodies your Kiraitus and others extract in return. It must be great to be Meru.