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Database Of Mass Shooters Revised And Expanded

SAINT PAUL, Minn., July 28, 2020 /PRNewswire/ -- The Violence Project has released an updated and expanded version of its comprehensive database of mass shooters.

The Violence Project Mass Shooter Database already included over 170 mass shooters who killed 4 or more people in a public setting since 1966 coded on 100 pieces of life history information. This update adds 50 new items for journalists, researchers, students, and policymakers to interact with. The goal of this project is to provide data to ground our public policy conversations and to develop data-driven prevention strategies.

The Violence Project Mass Shooter Database was funded by the National Institute of Justice, the research arm of the U.S. Department of Justice, and developed by professors Jillian Peterson and James Densley in collaboration with a team of students at Hamline University in Saint Paul, Minnesota. The entire database is downloadable for free at www.theviolenceproject.org.

Version 2.0 of the database is being released to coincide with the one-year anniversary of the mass shootings in El Paso and Dayton, which claimed 32 lives over a 24-hour period. The database now includes names and information for all 1,215 people killed in a mass shooting since 1966—the youngest was 18 months, the oldest was 98. It also includes a new firearms database of all 377 guns used in mass shootings since 1966, individually coded by when and how they were obtained. Although two-thirds were legally obtained, 30% of guns used in mass shootings came into the shooter's possession within the month prior to being used.

The new database also includes extended information on "leakage" (communication to a third party of an intent to do harm). Most shooters who leaked their plans did so in person to their wives, coworkers, and friends, the data show. School shooters were most likely to leak their plans ahead of time and did so in every case but one.

There have been far fewer opportunities for mass shootings to occur this year with public spaces closed and people in lockdown, with only one new case in 2020—the Milwaukee Molson Coors shooting in February. However, the coronavirus pandemic has roiled the economy and exacerbated social isolation and domestic strife—all risk factors for mass shootings. Lead investigator Dr. Jillian Peterson observes, "There are a lot of unmet needs right now. How we transition people back to school and work is crucial if we are to avoid more tragedy."

Over 80% of mass shooters were in a noticeable crisis prior to their shooting. The new database breaks down that crisis into its component parts, like increased agitation, isolation, mood swings, and paranoia. The role of psychosis in mass shootings is also better accounted for. Psychosis directly motivated a mass shooting in 11% of cases, but 70% of the time, psychosis played no role at all. In 19% of mass shootings, psychosis played some role, but the shooter had other motives.

Other new items include a history of domestic violence (33% of perpetrators), a measure of firearm proficiency (higher proficiency was correlated with more deaths), violent video game playing, hate group association, childhood socioeconomic status, past school performance, community involvement, and information on siblings (mass shooters were most likely to be youngest children).

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SOURCE Hamline University; The Violence Project