On Saturday, Harvard University announced that it would not be permitting law professor Ronald S. Sullivan Jr. to stay on as faculty dean of Winthrop House, an undergraduate residence where he has served in that position since 2009 (along with his wife Stephanie R. Robinson, who also teaches at Harvard Law School). When I heard news of this, my mind rushed back to a guided tour I’d once taken of Boston’s Freedom Trail, a two-and-a-half mile path that features numerous historical landmarks, including the site of the 1770 Boston Massacre, Paul Revere’s home and Bunker Hill Monument. At the time, I’d just arrived from Canada as a student at Harvard Law School. And I was eager to bring myself up to speed on America’s revolutionary history. The most memorable story I heard during that tour was of a young John Adams, a future U.S. president, successfully defending Thomas Preston, a Captain of a redcoat British regiment who’d been accused of ordering the aforementioned massacre after British soldiers were hit with rocks and snowballs. When the …