Ten years ago today, Eric Harris and Dylan Klebold stormed their high school with bombs and guns. They killed 15 people, including themselves, and injured 23 others, some severely. The nation thought the shooters’ parents were mostly to blame. Adults cast a suspicious eye on high-school-age males who were bullied, played violent video games, listened to Marilyn Manson, took an interest in the macabre, enjoyed shooting guns, or dressed like “Goths.” Americans had to respond somehow, but at the time they could not respond to the facts: There was little information available, and much of what was available was false....