These are statues of influential contributors to American history. Confederate or Union soldier, you're still a US veteran. The civil war is an important part of American history and contained important people on both sides. You might call the CSA a bunch of traitors, but let's not forget that the "United States", from the beginning (which was originally a confederacy), were also traitors who fought for slavery. Regardless, the statues here are devoted to important and influential people in the states histories, which they are. There is no reason that people should have to forget about them.