A comparative analysis of North American adolescent and adult mass murderers.

Thirty adult mass murderers and 34 adolescent mass murderers in North America are compared on both offender and offense variables to delineate similarities and differences. Findings indicate a plethora of psychiatric disturbances and odd/reclusive and acting-out personality traits. Predisposing factors include a fascination with weapons and war among many of the adolescents and the development of a "warrior mentality" in most of the adults. Precipitating factors indicate a major rejection or loss in the hours or days preceding the mass murder. Results are interpreted through the lens of threat assessment for targeted violence (Borum, Fein, Vossekuil, & Bergland 1999), recognizing that a fact-based, dynamic behavioral approach is most useful for mitigating risk of such an extremely low-base-rate violent crime.

[1]  Robert A. Fein,et al.  Preventing Attacks on Public Officials and Public Figures: A Secret Service Perspective , 1998 .

[2]  D. Cornell,et al.  Psychopathy in instrumental and reactive violent offenders. , 1996, Journal of consulting and clinical psychology.

[3]  Dietz Pe,et al.  Mass, serial and sensational homicides. , 1986, Bulletin of the New York Academy of Medicine.

[4]  J R Meloy,et al.  Offender and offense characteristics of a nonrandom sample of adolescent mass murderers. , 2001, Journal of the American Academy of Child and Adolescent Psychiatry.

[5]  G. VandenBos,et al.  Violence on the job : identifying risks and developing solutions , 1996 .

[6]  T. Kent,et al.  The effects of phenytoin on impulsive and premeditated aggression: a controlled study. , 1997, Journal of clinical psychopharmacology.

[7]  R. Kirk.  Practical Significance: A Concept Whose Time Has Come , 1996 .

[8]  J. Meloy,et al.  Investigating the role of screen violence in specific homicide cases. , 2001, Journal of forensic sciences.

[9]  M S Buchsbaum,et al.  Reduced prefrontal and increased subcortical brain functioning assessed using positron emission tomography in predatory and affective murderers. , 1998, Behavioral sciences & the law.

[10]  S. Freud.  Formulations Regarding the Two Principles in Mental Functioning , 1951 .

[11]  Ann Wolbert Burgess,et al.  Crime Classification Manual , 1992 .

[12]  Robert A. Fein,et al.  Safe School Initiative: An Interim Report on the Prevention of Targeted Violence in Schools , 2000 .

[13]  J. Westermeyer.  Grenade-Amok in Laos: a Psychosocial Perspective , 1973, The International journal of social psychiatry.

[14]  J R Meloy,et al.  Communicated threats and violence toward public and private targets: discerning differences among those who stalk and attack. , 2001, Journal of forensic sciences.

[15]  M. Hersen,et al.  Risk factors in school shootings. , 2000, Clinical psychology review.

[16]  L H Studer,et al.  Rethinking risk assessment for incest offenders. , 2000, International journal of law and psychiatry.

[17]  J. Stern,et al.  Terror in the Name of God: Why Religious Militants Kill , 2003 .

[18]  J. Meloy.  The Psychopathic Mind , 1977 .

[19]  N. Cameron.  The Paranoid Pseudo-Community Revisited , 1959, American Journal of Sociology.

[20]  Jeffrey A. Roth,et al.  Understanding and Preventing Violence , 1992 .

[21]  J. Reid Meloy,et al.  The Violent True Believer , 2001 .

[22]  J. Meloy,et al.  Bombing and psychopathy: an integrative review. , 1998, Journal of forensic sciences.

[23]  B. Vossekuil,et al.  Threat Assessment: An Approach To Prevent Targeted Violence: (517592006-001) , 1995 .

[24]  J. Reid Meloy,et al.  The Psychology of Stalking , 1998 .

[25]  R A Fein,et al.  Assassination in the United States: an operational study of recent assassins, attackers, and near-lethal approachers. , 1999, Journal of forensic sciences.

[26]  P E Dietz,et al.  Mass, serial and sensational homicides. , 1986, Bulletin of the New York Academy of Medicine.

[27]  John Monahan,et al.  Violent storms and violent people: How meteorology can inform risk communication in mental health law. , 1996 .

[28]  C H Cantor,et al.  Mass homicide: the civil massacre. , 2000, The journal of the American Academy of Psychiatry and the Law.

[29]  A. Freud.  The Ego and the Mechanisms of Defence , 1960 .

[30]  J. Reid Meloy,et al.  Indirect Personality Assessment of the Violent True Believer , 2004, Journal of personality assessment.

[31]  Richard J. Hazler,et al.  Bullying: Perceptions of Adolescent Victims in the Midwestern USA , 1992 .

[32]  D. Phillips,et al.  Imitative suicides: a national study of the effects of television news stories. , 1982, American sociological review.

[33]  E. Mulvey,et al.  The inherent limits of predicting school violence. , 2001, The American psychologist.

[34]  Leland Wilkinson,et al.  Statistical Methods in Psychology Journals Guidelines and Explanations , 2005 .

[35]  J. P. McGee,et al.  The classroom avenger: A behavioral profile of school based shootings. , 1999 .

[36]  J R Meloy,et al.  Offender and offense characteristics of a nonrandom sample of mass murderers. , 1999, The journal of the American Academy of Psychiatry and the Law.

[37]  D. Phillips,et al.  The Impact of Mass Media Violence on U.S. Homicides , 1983 .

[38]  B Vossekuil,et al.  Threat assessment: defining an approach for evaluating risk of targeted violence. , 1999, Behavioral sciences & the law.

[39]  J. Meloy.  Predatory violence during mass murder. , 1997, Journal of forensic sciences.

[40]  R. Levine,et al.  A cross-cultural review of sudden mass assault by a single individual in the oriental and occidental cultures. , 2000, Journal of forensic sciences.

[41]  M. McCloskey,et al.  Neurobiology of Violence and Aggression , 2003 .

[42]  J. Westermeyer.  On the epidemicity of Amok violence. , 1973, Archives of general psychiatry.