Flag etiquette is a touchy subject in this country. The U.S. Supreme Court has ruled that burning the American Flag is a protected form of speech under the First Amendment. Still, we hear calls from elected politicians that displaying the Confederate Flag is not protected speech.
The beginning of the Confederate War was never about slavery, it was about the massive tax burden being imposed by the North against southern businessmen. The slavery issue arose two years into the Civil War and at that point the Stars and Bars and slavery were forever linked.