In a year already packed with one shock after another for the sports world, NASCAR’s decision to ban the Confederate flag at its events is a welcome — if not surprising — turn of events.The stock car racing authority responded quickly and decisively to a call by Bubba Wallace, the sport’s lone full-time Black driver, to remove the highly controversial flag from its tracks. For a sport that is especially popular south of the Mason-Dixon Line, the move is both hugely significant and not without the risk of alienating at …