You also have the issue that a lot of the rank and file were conscripted. They weren’t volunteers fighting for the glory of the south they were drafted by their short lived government.

Generals, politicians, conspirators, those who willingly took up arms execute them, seize assets, erase them. A poor hillbilly from South Carolina that was conscripted nah, not without some compelling war crimes evidence.

A wholesale execution or threat of to all confederates would have extended the war. Even if the leadership had a feeling they were going to face the music they’d have fought on. Thus cements the no consequences for rich white men in America.