This one, to me, sounds like a guy who just snapped.
Some US mass shootings...
Here is a glance at some of the worst U.S. mass shootings:
April 3, 2009: A 41-year-old man opened fire at an immigrant community center in Binghamton, N.Y., killing 11 immigrants and two workers. Jiverly Wong, a Vietnamese immigrant and a former student at the center, killed himself as police rushed to the scene.
March 10, 2009: Michael McLendon, 28, killed 10 people, including his mother, four other relatives and the wife and child of a local sheriffs deputy, across two rural Alabama counties. He then committed suicide.
Feb. 14, 2008: Former student Steven Kazmierczak, 27, opened fire in a lecture hall at Northern Illinois University in DeKalb, fatally shooting five students and wounding 18 others before committing suicide.
Dec. 5, 2007: Robert A. Hawkins, 19, opened fire with a rifle in Omaha, Neb., at a Von Maur store in the Westroads Mall, killing eight people before taking his life. Five more people were wounded, two critically.
April 16, 2007: Cho Seung-Hui, 23, fatally shot 32 people in a dorm and a classroom at Virginia Tech in Blacksburg, then killed himself in the deadliest mass shooting in modern U.S. history.
Feb. 12, 2007: Sulejman Talovic, 18, killed five and wounded four at the Trolley Square mall in Salt Lake City. He was then shot and killed by police.
Oct. 2, 2006: Charles Carl Roberts IV, 32, shot to death five girls at West Nickel Mines Amish School in Pennsylvania, then killed himself.
March 21, 2005: Jeffrey Weise, a 16-year-old student, killed nine people his grandfather and his grandfathers companion at home, and then five fellow students, a teacher and a security guard at Red Lake High School in Red Lake, Minn. before killing himself. Seven students were wounded.
March 12, 2005: Terry Ratzmann, 44, gunned down members of his congregation as they worshipped at the Brookfield Sheraton in Brookfield, Wis., slaying seven and wounding four before killing himself.
July 29, 1999: Former day trader Mark Barton, 44, killed nine people in shootings at two Atlanta brokerage offices, then committed suicide.
April 20, 1999: Students Eric Harris, 18, and Dylan Klebold, 17, opened fire at Columbine High School in Littleton, Colo., killing 12 classmates and a teacher and wounding 26 others before committing suicide in the schools library.
March 24, 1998: Andrew Golden, 11, and Mitchell Johnson, 13, killed four girls and a teacher at a Jonesboro, Ark., middle school. Ten others were wounded in the shooting.
December 1, 1997: Michael Carneal, 14, opened fire on a group of praying students killing 3 young women, injuring four young women, and wounding one young man at Heath High School in West Paducah, Kentucky.
Oct. 16, 1991: George Hennard, 35, smashed his pickup through a Lubys Cafeteria window in Killeen, Texas, and fired on the lunchtime crowd with a high-powered pistol, killing 22 people. At least 20 others were wounded.
Aug. 20, 1986: Postal worker Patrick Henry Sherrill killed 14 people in an Edmond, Okla., post office, then killed himself.
July 18, 1984: James Oliver Huberty, 41, an out-of-work security guard, shot and killed 21 people at a McDonalds restaurant in San Ysidro, Calif. He was slain by police.
Aug. 1, 1966: Former Marine sharpshooter Charles Whitman climbed the stairs to the observation deck at the University of Texas Tower and began a 96-minute shooting spree, killing 14 people and wounding 31 before he was shot and killed. He had stabbed his mother and wife to death earlier.
Mass shootings/killings have been part of our society for a long while now... On and on it goes...