1. Banks would rather lend to government, corporates and high net individuals than common Mwananchi who can default easily.
2. Unlike other jurisdictions where interest rate are low, Kenya does not have synchronized data of an individual. Those countries when you borrow in banks, they banks knows which properties they own, where they are etc.
3. The premium collateral in Kenya is land. You know how the registry is. One parcel with 2 or more genuine titles.
4. Banks have shareholders who expect returns. You reduce the profits and the shares dips. Banks account for 40% market capitalization at the NSE. If they dip the market crumbles
There are alot of things that need to be sorted out first before capping those rates.