They were killing each other off in Africa in tribal warfare well before anyone knew what Muslims were.
Granted Muslims are a cancer to this earth now in it's current form, but Africa was not always a Muslim issue IMO.
That's not quite true. Muslims have been killing in Africa almost from the beginnings of Islam. While there was and is some tribal warfare, most warfare is Muslim sponsored, it's just that most people dodn't realize that they were muslims, thanks in part to media hiding that fact in recent times.