but there is no clear indication why he did so. or why adam lanza targeted sandy hook, a school where he used to go. what emerges is a picture of a deeply troubled 20-year-old, a loner, obsessed with mass murder. he spent hours a day playing video and computer games, many violent, including "call of duty." another called "school shootings." the report also references another report not shown, images of lanza pointi ining guns to h head. and surprisingly, he seemed fixated on the video game, "dance, dance revolution." and spent hours playing it down the street. his computer hard drive was smashed making it nearly impossible to retrieve information. but investigators found a spread sheet detailing mass murders, including this "new york times"