The United States, and the world, learned in horror last week that a 23-year-old student at Virginia Tech had gone on a shooting rampage, killing 32 people and himself. It was the worst mass shooting in American history. Amid the shock and grief, we quickly discovered that there were many warning signs that the killer, Seung-Hui Cho, was deeply disturbed. An article in today's New York Times—Before Deadly Rage, a Life Consumed by a Troubling Silence—explains that Cho always isolated himself. "From the beginning, he did not talk," wrote N. R. Kleinfield, "Not to other children, not to his own family. Everyone saw this. In Seoul, South Korea, where Sueng-Hui Cho grew up, his mother agonized o …
