Robert E Lee was himself not a fan of Civil War memorials (of any kind, including and especially battlefields) for exactly the reason that they keep the wounds from healing, and said the following regarding them:
I cannot personally agree that a collective forgetting of history is a good thing (those who forget history yadda yadda yadda) but there is a good point about not trying to keep the feelings that led to such strife alive. We must forgive but not forget.
Of course, choosing not to memorialize racists who condoned the murder of POWs and the enslavement of blacks is not the same thing as forgetting history.
Grant saw Lee’s posturing after the war as empty and self serving, saying that Lee was “setting an example of forced acquiescence so grudging and pernicious in its effects as to be hardly realized.”