I grew up in a place where the nearest town has a confederate monument. The monument
is protected by state law (unless said law has been repealed without my knowledge) which states that only the NC legislature has the power to remove any memorial. It stands in front of the county courthouse and was erected in 1902,
on the early end of the first Confederate monument craze.
Let me deal with the artistic argument first, so that I can get to what I really want to say. These monuments were mass-produced and sold out of catalogues. They were Confederate kitsch. Because of their age they might be of interest to collectors, much like there are people who collect buttons, but just like that doesn't make buttons art, lets not fool ourselves into thinking these Confederate monuments are art. (Now some might be, but that is an individual judgment, not something to be granted up front to all of them).
It is important to not confuse history, nostalgia, and propaganda. Just because they all interact with the past, it does not follow that they all interact properly with the past. Confederate monuments are rarely teaching the first (and the ones that do are mostly found in battlefields), usually the second, and almost always the third. Let's take the monument I grew up near as an example, two lines in particular.
"THE CONFEDERATE SOLDIER WON AND IS ENTITLED TO THE ADMIRATION OF ALL WHO LOVE HONOR, AND LIBERTY."
and
"IN APPRECIATION OF OUR FAITHFUL SLAVES"
You cannot separate when the monument was erected, with its purpose. During this time, Jim Crow laws were being passed in North Carolina (
one such law passed a year before our monument was erected stated, no child with "Negro blood in its veins, however remote the strain, shall attend a school for the white race, and no such child shall be considered a white child). As late as the 1896 the Republican-Populist "fusion" party, which had African Americans as a core constituency, was the party in power. 1898 the Democrats ran a explicitly white-supremacy platform which won.
Read the Chairman of the Democratic Party's editorial in the Raleigh News and Observer:
"The battle has been fought, the victory is within our reach. North Carolina is a WHITE MAN'S State, and WHITE MEN will rule it, and they will crush the party of negro domination [the fusion party] beneath a majority so overwhelming that no other party will ever again dare to attempt to establish negro rule here.
They CANNOT intimidate us; they CANNOT buy us, and they SHALL NOT cheat us out of the fruits of our victory." (emphasis his)
Later on he mentions that it is only white rule over African-Americans that can cause peace between the races. Now look at our confederate memorial put up just a couple years after the victory of the Democrats. You can almost feel the Jim Crow judgment as you read "faithful slaves" and the resulting rhetorical standard with which to judge their former slaves' descendants who needed to relearn their proper place. The fusionists had temporary upended the "proper" order. The Confederates (and the memorial self-identifies the ones who erected it as Confederates) are rhetorically reconstructing their history into a nostalgic pseudo-past where their white ancestors paternalistically ruled over obedient slaves.
It is no wonder that the Confederate monument declares "the Confederate soldier won." The election of 1898 ushered in an explicitly white rule in North Carolina not seen since the Civil War. The Confederate and Confederate sympathizers who put the monument in front of the courthouse were not putting up a historical marker. They were mythologizing the past and placing a piece of white propaganda in front of the place where law and justice was dispensed (I don't think the symbolism of their chosen location was lost on them).
If these Confederate monuments are to be viewed as markers of our historical heritage, it is not of the Civil War but rather a historical heritage to the propaganda and self-identity of the later Jim Crow South. By leaving them alone, you are allowing their propaganda to stand unchallenged on public land.
You can see the full text of the monument to which I am referring and see pictures of it
here.