the history is that the South fought the United States of America and any relic that calls back on the history of that and supports it is supporting a notion AGAINST the United States of America.
The notion of being an American is a modern one. This is one of the hardest things for contemporary Americans to understand - we see our nation as one entity.
In the mid-18th century, people regarded themselves as Virginians, Carolinians, Rhode Islanders, Pennsylvanians, etc.
There was no national identity. It really is difficult for our mobile society to understand that kind of loyalty to a place. But in the 19th century, you were born somewhere, you died there. You never left your home state, probably not even your home town. Remember too, "The United States of America" was only 60-70 years old when the conflicts that led to the Civil War started.
Robert E. Lee was originally offered the command of the United States Army. He turned it down, because he could not bear to take up arms against his home -
Virginia, not the Confederacy, not the US. You really have to put yourself in the mindset of a person from that era.
Look, I'm not sorry that the United States won the Civil War. Our nation is best served by being exactly that - one, united nation.
But tell me why the southern secession is any different, politically, than the American Revolution?
You have a group of citizens who are unhappy with their government, and conclude that it is within their rights to separate and form their own country.
That is what the Civil War boils down to. A group of states said "we don't want to be a part of the US anymore", and the US government said "too bad, you don't have that choice". And they fought.
And that is exactly what Jefferson et al said in 1776 - "we don't want to be a part of England anymore", and England said "too bad, you don't have that choice" and they fought.
Lincoln himself had great respect for the politicians and military leaders of the Confederacy. When he knew the North had won the war, he asked the White House musicians to play "Dixie" in honor of the South.
If Lincoln did not consider those men traitors, I certainly won't question his judgement.