Firstly, Bantus are nowhere near 15% of the population, Secondly, they have only been here since the early 1800s, Thirdly, Bantus were in fact treated very well during their enslavement, Italian traveler Luigi Roberto Brichetti who visited Mogadishu in the 1890s mentioned that Somali families treated their bondsmen so well that if slaves were given the option of freedom they would reject it. He mentions Somalis fed their slaves from their own rations and clothed them with their same clothes.
Bantu's had numerous options of procuring freedom some even fought with their masters during battle and if they should great martial brilliance or tremendous valor they could be granted there freedom. Upon attaining freedom their masters provided them a wife, land, and cattle so they could start their own families of course under the tutelage of their previous masters.
We must also remember that Somali slavery was a civilizing mission, not only was Somalia more technologically advanced than South East Africa it was also superior morally and religiously superior through the twofold combination of Islam and Somali cultural norms which greatly elevated the Bantus from their formerly debased and pagan way of life.
Why should Somalis be ashamed for not only elevating an inferior people and enriching them mentally, physically, morally, and spiritual but also doing it in one of the most humane ways possible. Instead of being ashamed of our past with our Bantu brethren we should instead celebrate our ancestors noble pursuit in civilizing a wayward peoples.
All of the information I provided on Somali slavery can be found in Dr. Catherine Bestman's seminal work Unraveling Somalia: Race, Class,and the Legacy of Slavery
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