The Main Reason We Don't Believe We Have African Ancestry Is ...

Because our ancestors told us we didn't. It's like that ol' time religion, if it was good enough for grandma, it's good enough for me. Besides, no one has ever shown us any proof of it. I ain't saying there's anything wrong with having African ancestry, but just as it would pretentious for me to claim to be descended from Charlemagne without proof, it's ludicrous for anyone else to say I have African ancestry without proof. It's sort of like that Jerry Seinfeld line, "not that there's anything wrong with it."