J. Richard Cohen is president of the Southern Poverty Law Center Exactly whose heritage does it celebrate? Following the church shooting this week, South Carolina Gov. Nikki Haley offered powerful words of healing and said the “people of South Carolina need us to come together and be strong.” But at the same time the state’s citizens are being urged to “come together,” the state continues to display a divisive symbol — the Confederate flag — outside the state Capitol. Reacting to calls to remove it, Sen. Lindsey Graham said the flag “is part of who we are.”His answer makes...