Murder by Proxy: How America Went Postal (2010)

The film explores the basic question of what brings a seemingly normal person to the point of committing mass murder. It examines the complex interplay of personal and societal factors leading up to incidents of workplace massacres, starting with the earliest post office massacre in 1986. Ultimately, it provides a thorough and provocative examination into the increasing number of mass murders in the United States, examining how and why they continue to occur, and what this phenomenon might lead to in the future.