Kenya is not heaven on earth. If you expected everything in Kenya to be 100% good just because we score high in HDI then am sorry that's not the case. We are a developing country with a host of challenges, just like any other.
But the beauty with it is that despite UN reports showing we have a host of challenges like the ones you have highlighted above, the same UN reports also show that we score high in HDI. Isn't it funny that you are only comfortable with certain UN reports about Kenya but dismiss certain sections of the same UN reports? What makes one UN report true in your eye but dismiss another report by the same UN? Double standards can't get better than this.
And by the way, can you show us UN reports showing Tanzanians living in better houses? At least I can show you a UN report showing Tanzanians living in extreme poverty