Mohamedou Ould Slahi, who documented his torture and imprisonment in the 2015 Guantánamo Diary, on Monday was finally returned home to his native Mauritania. Upon his release, Slahi said, “I feel grateful and indebted to the people who have stood by me. I have come to learn that goodness is transnational, transcultural, and trans-ethnic. I’m thrilled to reunite with my …