Slavery was LEGAL at that time! But the secession was about economics and rights ... not about slavery. The South was tired of a bunch of Yankee extremists trying to tell them how to run their own livelihoods and economy. Of Yankees trying to ramrod laws through Congress which were detrimental to the Southern economy. Yet the whole time, the Yankee textile mills in New York and Massachussettes were depending on Southern cotton to be supplied for the making of cloth. So you have the Yankees crying about slavery on one hand, and supporting it with their textile mills on the other. Hypocrisy in action, but then the Yankees were noted for that! And that hasn't changed much over the years!
By the way, as I've pointed out to others before, more abuses of human rights were carried out under the Stars and Stripes than were ever carried out under the Stars and Bars, its a historical fact! Unless you're a proponent of revisionistic PC history!
You sound like some PC driven left winger who doesn't care about 1st Amendment Rights and individual liberties. You would rather we all conform to some State sponsored idea of what is "sensitive" and correct, and "good for society". In a free society some folks will get offended from time to time, they just have to grow thicker skins and quit whining!