The Confederate Flag represents an era of unrest and convoluted visions of a Country that no longer exists. The Confederate States of America stood to stand Human Beings from Equal, stood for oppression and evil, and we have States that embrace this as though it's something to be proud of. Claiming it's "Freedom of Speech" or "Free Country", without realizing that the symbol causes more harm than it does good.
To make a fair example, let's use another group of people who used a separate flag of their country to do heinous and evil acts. Where do you see the Nazi Flag flying ANYWHERE freely. There are acts that have made it illegal to display it. Different methods, different crimes, same meaning. The Confederate Flag is a Symbol of Oppression and Suffering, and needs to be removed.