Bowling for Columbine (2002)- Michael Moore

a controversial documentary film written, directed, produced by, and starring Michael Moore.
The film explores what Moore suggests are the causes for the Columbine High School massacre and other acts of violence with guns. Moore focuses on the background and environment in which the massacre took place, and some common public opinions and assumptions about related issues. The film looks into the nature of violence in the United States, focusing on guns as a symbol of both American freedom and its self-destruction.
http://en.wikipedia.org/wiki/Bowling_for_Columbine