Just don't touch those monuments. Leave history to history. Problem solved.
Here's the issue with that particular line of reasoning (and I touched on it in a few other threads).
These statues aren't "historical" in the sense that people seem to think they are.
People speak as if they're under the impression that these monuments were put up by people who served under these men to pay respect to commanding officers they knew and respected.
The reality is, most of these monuments were put up in 1910-1930 by Jim Crow segregationists who never personally knew the men, they just wanted to send a message. Or another way of putting it, the same men putting up the statues of confederate generals were the same men putting up signs that stated that "colored people" had to use a different bathroom.
The "historical value" angle is a bit of a disingenuous one when you consider the facts and the context.
A comparable example...while it's true that the American-Indian wars were part of our history that certainly need to be remembered... It'd be like if a group of Anti-Native American bigots started propping up monuments to Andrew Jackson's generals right next to the Indian reservations 70 years after the fact, and when confronted about it, tried to use the rationale of "well, the events were part of our history and we can't forget history".
It'd be pretty obvious at that point what their agenda was and people would quickly realize "wait a minute, this has nothing to do with history, you're just taunting the people you don't like"
That's what was happening when Jim Crow era leaders were putting up those confederate statues in the 1920's & 30's.