Ah, yes, the knowledge that Thomas Jefferson and George Washington owned slaves has greatly enlightened historians to declare that they do not deserve our respect as Founding Fathers. Of course, the fact that slavery was an institution as old as mankind, and the complexities of the economic imperatives that fostered it, do not rise to the level of relevance.
Spare me the apologies for "revisionism" -- the omissions from public school history books, due to politically-correct "revisionism," has not fostered the enlightenment of our children, or the collective historical knowledge of our society.