Assassination Generation: Video Games, Aggression, and the Psychology of Killing

The author of the 400,000-copy bestseller On Killing reveals how violent video games have ushered in a new era of mass homicide -- and what we must do about it.

Paducah, Kentucky, 1997: a 14-year-old boy shoots eight students in a prayer circle at his school.

Littleton, Colorado, 1999: two high school seniors kill a teacher, twelve other students, and then themselves.

Utoya, Norway, 2011: a political extremist shoots and kills sixty-nine participants in a youth summer camp.

Newtown, Conn...