I will say in all seriousness that history is never black and white (lol pun). If you think the Confederacy was synonymous with someone like the Nazi's, you've been fed history and not learned anything yourself. The Union had plenty of flaws and the Confederates had plenty of virtues, and the opposite is true as well. 

Confederate monuments being taken down is ok, though somewhat sad in my book since it's a piece of history. But calling them bad people is about as ignorant as...well as ignorant as a racist is, ironically enough. Slavery would have been abolished in the south within 20 years as well due to industrialization, just like industrialization had killed the slave trade in the North. The Union didn't one day wake up from a two hundred year nap and go "SLAVERY IS WRONG!" They freed the slaves for economic reasons, and to conform with how the rest of europe was acting. They knew transatlantic trade wouldn't go well if Slaves were being used. That and, if they could exploit immigrants, why have slaves when essentially the same work was being done for almost no cost by making the Irish do a lot of the shit labor, and others?