To explain the genesis of mass murder committed by students at their schools, the authors propose a five-stage sequential model in which several criminological theories (strain theory, control theory, and routine activities theory) are brought to bear collectively to demonstrate their cumulative effect. These stages are as follows: chronic strain, uncontrolled strain, acute strain, the planning stage, and the massacre. Long-term frustrations (chronic strains) experienced early in life or in adolescence lead to social isolation, and the resultant lack of prosocial support systems (uncontrolled strain) in turn allows a short-term negative event (acute strain), be it real or imagined, to be particularly devastating. As such, the acute strain initiates a planning stage, wherein a mass killing is fantasized about as a masculine solution to regain lost feelings of control, and actions are taken to ensure the fantasy can become reality. The planning process concludes in a massacre facilitated by weapons that enable mass destruction in schoolrooms and campuses, where students are closely packed together. Based on this analysis, prevention strategies are suggested.

Prior research has shown that many mass shooters have explicitly admitted they want fame and have directly reached out to media organizations to get it. These fame-seeking offenders are particularly dangerous because they kill and wound significantly more victims than other active shooters, they often compete for attention by attempting to maximize victim fatalities, and they can inspire contagion and copycat effects. However, if the media changes how they cover mass shooters, they may be able to deny many offenders the attention they seek and deter some future perpetrators from attacking. We propose that media organizations should no longer publish the names or photos of mass shooters (except during ongoing searches for escaped suspects), but report everything else about these crimes in as much detail as desired. In this article, we (1) review the consequences of media coverage of mass shooters, (2) outline our proposal, (3) show that its implementation is realistic and has precedent, (4) discuss anticipated challenges, and (5) recommend future steps for consensus building and implementation.

This study examined the 15 deadliest public mass shootings in the United States from March 1998 to February 2018 to assess (a) leakage of violent thoughts/intent, (b) leakage of specific interest in mass killing, (c) concerning behaviors reported to law enforcement, (d) concerning interest in homicide reported to law enforcement, and (e) firearms acquisition. We then compared our findings on the deadliest public mass shooters with the Federal Bureau of Investigation’s (FBI) findings on active shooters in general. Overall, the results suggest that most incidents were indeed preventable based on information known about offenders in advance, and that the deadliest mass shooters exhibited more warning signs and were more often reported to law enforcement than other active shooters. Future prevention efforts should aim to educate, encourage, and pressure the public to report warning signs to law enforcement, educate and train law enforcement so that they can more effectively investigate potential threats, and limit firearms access for people who have admitted having homicidal or suicidal thoughts or being interested in committing a mass shooting. These relatively straightforward steps could significantly reduce the prevalence of future attacks.

Although animal cruelty is often described as a warning sign of future human violence, particularly in the prediction of multiple homicides, prior studies reveal mixed support for this notion and lack conceptual clarity in the measurement of such cruelty. This study investigates the quantity and quality of cruelty present in a sample of 23 perpetrators of school massacres from 1988 to 2012. Findings indicate that 43% of the perpetrators commit animal cruelty before schoolyard massacres and that the cruelty is usually directed against anthropomorphized species (dogs and cats) in an up-close manner. The implications of these findings for reducing false positive cases of cruelty are discussed.

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