A year from now, the good people of Highland Park will be wondering whether to hold a parade. There will be a school of thought believing the town must get back to something approaching Independence Day normalcy, if only for the sake of its children; others will worry that a parade will trigger the trauma of 2022, when a hidden assailant fired his assault-style rifle in the direction of grandparents and kids, community stalwarts and hardworking parents. He killed six and sent 30 more to hospitals that were expecting nothing more of the day than a few minor injuries from fireworks. There will b…