Not to mention that when White colonizers arrived to Africa slavery and slave trade was already a budding business there (and it still continues to be that way -- see e.g. enslavement of Pygmies by Bantu people). Whites merely hopped on the (disgustingly convenient) bandwagon, made some agreements with local African rulers (i.e. Black, in case someone does not get it), and together they made a lot of cash.
Alas, that's an inconvenient fact for anyone obsessed with finger pointing and blind revenge. And this is not exclusive to Black people. There are substantial portions of Jewish population that are obsessed with the same (see e.g. Chabad or other ultra-orthodox communities and their ideologies).
Well, as I like to say, everyone should clean up their own house first.
And just one of many accounts in this regard:
