Clearly our knowledge of Africa is at variance.
Nigeria is on the coast of West Africa. "Neighbouring" Ruwanda is nearly three thousand miles away - inland Central Africa. In any case I think the the farmers you mention might have been those invited from Zimbabwe. Given Nigeria's history since independence, once its decayed farming machine becomes well-oiled, productive and profitable, it will be interesting to see how long the whites will be encouraged to stay on.
As for not being corrupt I don't want to go into lengthy detail. Do mentions of "Biafra" and "cement" for instance, chave significance for you? :-)