Furthermore, they are wrong in assuming that some theories are not better than others. The history of science could supply them with plenty of examples of theories replacing other theories because they are superior to the ones they replace. Afrocentrists, on the other hand, seem to believe that all truth is subjective. Truth is whatever you want it to be. Since historians interpret facts differently, there is no such thing as historical accuracy.
Any interpretation is as good as any other, epistemologically speaking.
Morally, some views are superior to others. It is just arrogance and racism which gives greater value to white theories than to Afrocentrist theories. Whites interpret the same data differently from Afrocentrists because whites have a different agenda. Differences of opinion are not resolvable by scholarly argument over evidence, because all scholars are biased. To an Afrocentrist the fact that we do not know who Cleopatra's paternal grandmother was is sufficient evidence to justify believing that Cleopatra was a black African.