Then they were traitors who dont deserve statues.The land belong to the States it was a very different time and the Federal Government had very little power when compared to today. The courts ruled secession was legal at the time in retrospect. A law was passed after the war to prevent secession is now illegal.
The statues exist because all civil war soldiers were named US veterans by an act of congress many honor the fallen like the one that was destroyed today. The Daughters of the Confederacy raised most of them to remember the war as they lost husbands and children and spent much of the war burying men and treating the wounded.
The Civil war was 152 years ago.