Respectfully but totally disagree with you about Lee, John. While it is true that he only decided to join the confederate cause after Virginia had seceded, as the commander of the Army of Northern Virginia, whose mission it was to destroy the Army of the Potomac and hence the union for which it stood, he absolutely was treasonous and a traitor beyond all doubt. Now, that being said, please be aware that I have tremendous admiration and regard for Lee as being, along with Alexander the Great, Hannibal, Rommel and Guderian, as among the greatest military tacticians of all time. He was a brilliant commander who was always hugely outnumbered, sometimes as much as 2-to-1, and yet managed to rack up victory after victory. It was only after the war had dragged on into 1864 and the confederacy had been split in two by Grant's taking of Vicksburg thereby giving the union total control over the Mississippi River coupled with Sherman's advance into Georgia that crippled the south from both a morale and logistical standpoint and forced Lee to go on the defensive during the siege of Petersburg that led to the ultimate capitulation of the confederacy. The south would have conceivably been crushed far sooner if it had not been for Lee's brilliance in the field of battle.
Aside from that, however, he was most definitely a traitor. I use Lee as the example since it is his statue in Charlottesville over which the controversy was centered last Saturday. If it had been Forrest (who was, as you point out, perhaps the most glaring example of racism in the confederate military both during and immediately following the Civil War), I would have used him as the example instead. It is interesting to note, however, that although he was indeed the founder and first grand imperial wizard of the KKK, he also ordered it disbanded in 1869 and publicly eased back his racist views, something Lee never did.
Here's a really good article that serves to show that the mythical status of General Lee is just that....a myth.
https://www.theatlantic.com/politics/archive/2017/06/the-myth-of-the-kindly-general-lee/529038/