A black comedy is gruesome, vile, and wicked. The bad guys wear black hats and ride black horses. To cheat or double-cross some folk is to blackmail them. To arbitrarily exclude people from a group is to blackball them. The black list is for revenge and rejection.
Black magic is satanic and demonic.
The black market is the illegal economy. To be black in America is to be a partner in evil sociological statistics. To be a black Christian is to wrestle with the meaning of a God who loves and died for all, yet experience the exclusion and rejection by the very adherents of the Christian faith. To be black means that our history and culture is insignificant. Because God designed the physical features of every ethnic group, and all God's designs are essentially good, the physical features of every ethnic group are essentially good.