If the flag of an armed enemy of the U.S. is allowed to fly over government buildings, then it implies that slavery, or at least the threat of slavery, is sanctioned by that government and can still legally exist.
“The joke I wanted to put into one of the promos for this new season, was to have a guy come up to me and say, Hey! Tony! I love your show, I've watched you every night since you started! And then I'd say, Ah! You're the one!”
“Mayors do not have that authority to pick and choose what laws they're going to enforce.”