Those statues were not created with the intent of creating art. They are not historical in the sense of their subject. If we're talking about Confederate statues then they were largely created during the Jim Crow era, many in the 1950s-60s. They were created with the intent to harass and ostracize black people in America and promote white nationalism.

They are not art and have no historical value. If we want to preserve them, they should be in an exhibit about Jim Crow-era hate speech. And in that case, we don't need all of them; just prominent examples. We can take a chunk of Stone Mountain, for instance, to show next to pictures of it before it is dynamited.