When news broke April 16 of the worst mass shooting in U.S. history, the question many horrified Americans most wanted to answer was, "Who was the shooter?" It's an urgent and understandable question, but one that rests on a dangerous assumption: that if everyone only knew more about the killer, then what he did would make sense--and…

While college campuses are relatively safe environments, the promise of safety and security on campus was shattered by a single gunman on April 16, 2007. Seung-Hui Cho, a senior at Virginia Tech, shot 49 students and faculty, killing 32, before killing himself. The authors are psychologists and directors of university counseling centers; they…