Everyone needs to calm down and stop the knee-jerk reactions.  If "context" is added, then it needs to be full context: Slavery through history and the world, as well as the role of Africans in the slave trade.  Further the Jefferson/Hemings narrative is taken as gospel, however I read other sources stating Jefferson's brother was most likely the father.  I don't know that DNA can prove or disprove that.  That should also be part of the context.