Military brilliance is as objective as it gets. If anything, General Lee and Jackson is an inspiration to all who study military history and tactics. Together, they broke every rule in the book of military conventional wisdom. Especially with the laws of attrition in mind, they are among the top Generals ever to have walked the face of the earth. To take their portraits down would be a disgrace to the military profession.
That is quite true. Both were brilliant tacticians and leaders.
So was Rommel. Should we hang his portrait there as well?
Rommel wasn't an American. Lee and Jackson were Americans, and served in both the US and CSA Armies. A very poor analogy.
There is a statue of George Washington in London by the portrait gallery. Should the Brits remove it? He was a traitor yet they honor him