Then why not leave it at that, the truth? Why embellish it with nonsense about whole black confederate regiments and lies about Grant owning slaves until the ratification of the 13th Amendment? Aren't there enough facts about the confederate side to present without resorting to fabrications?
Not if you're trying to advance a larger agenda...
I am confident that if you wrote him in a polite manner he would answer you in the same vein.