By Rich Heiland, Columnist, The Times SERBIA? YES, SERBIA. It just did what the United States lacks the moral fiber, heart, soul and compassion to do. It said “enough” to gun violence and it only took two mass shootings. On May 3, a seventh-grade student shot down eight children and a security guard. A ninth victim died two weeks later. The next day a man shot and killed eight and wounded 14 others...