The US government is removing, 150 years later, the battle flag of the traitors to the nation? And they have a problem with this?
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Please do not misconstrue my comment as having a pro-slavery context but I must disagree with your statement that Confederate rebels were "traitors." They were secessionists and secession is not treason unless it takes place during a war with a foreign nation. Secession is not betrayal.
I am not a Southerner. I'm from Brooklyn. What I learned during the time I was stationed in North Carolina is all contemporary White Southerners are not descendant from slave-owners, nor did they, or do they, benefit in any way from the practice of slavery. In fact many White Southerners were, and are, opposed to it. Some of them quite bitterly.
Someone, I don't know who, has observed that;
"The South dislikes the Negro as a race but accepts him as a person, while the North accepts the Negro as a race but rejects him as a person."