the principles for which the South contended and which justified her struggle for those principles."

Absolutely, EB: the principles of slavery, white supremacy and treason.

Apparently Lee thought these principles were "justified" by what you've quoted.

If so, one more reason to get his memorials off public peroperty.

Now, look up Grant's support of the Reconstruction governments, of Black suffrage, of his attempts to eradicate the KKK.

You're confabulating history with selective cherry-picking to imply that Grant would have approved of these monuments celebrating slavery, white supremacy, Jim Crow & treason and would have been opposed to their removal.

That is demonstrably not the case.