Mass murders in the United States are rare, but they receive a lot of media attention and are the focus of an ongoing controversy regarding the link between mass murder and mental illness among the perpetrators of these heinous acts, almost always men.
The mental health problems most common in mass murderers and why men at risk are so difficult to identify before they can carry out mass killings are discussed in "Mass Murder, Mental Illness, and Men" in Violence and Gender.
Author Michael Stone, MD, Columbia College of Physicians and Surgeons and Mid-Hudson Forensic Psychiatric Hospital, New York, NY, takes an in-depth look at the scope of mass murders committed in the U.S. during recent decades, describing the crime as "an almost exclusively male phenomenon." Most mass murderers have a mental illness characterized by a paranoid personality disorder that includes a deep sense of unfairness and a skewed version of reality. Unfortunately, this profile of the men who have committed mass murders has often led to the unwarranted stigmatization of the mentally ill as a group as being inherently dangerous, which is not the case.
Stone points in particular to the growing availability of semiautomatic weapons as a key factor contributing to the increasing rate of random mass shootings in the U.S. during the past 65 years. The number of events nearly doubles in the 1990s compared to the 1980s, for example.
Citation: Stone Michael H..Mass Murder, Mental Illness, and Men, Violence and Gender, March 2015, 2(1): 51-86. doi:10.1089/vio.2015.0006.