It seems to me there's a genuine problem. For most people the Confederacy was an illegal conspiracy to keep a lot of people working for nothing, on racist grounds; for many Southerners it was a courageous war of independence in which a great many non-slave-owners fought and died. Naturally, statues of its heroes give mortal offense to the descendants of those they enslaved, and others. Might I suggest that real (Nineteenth Century, say) historical monument be moved to museums and kept safe there? It seems to me that it's where they belong.