1. Silver, J., Simons, A., Craun, S., “A Study of the Pre-Attack Behaviors of Active Shooters in the United States Between 2000 – 2013,” Federal Bureau of Investigation, U.S. Department of Justice (2018) at 22;

Google ScholarNational Threat Assessment Center , “Protecting America's Schools: A U.S. Secret Service Analysis of Targeted School Violence,” U.S. Secret Service, Department of Homeland Security (2019) at 15-16;

Google ScholarCenters for Disease Control and Prevention, National Center for Injury Prevention and Control , National Violent Death Reporting System, available at <https://www.cdc.gov/injury/wisqars/nvdrs.html> ().
Google Scholar

2. See Silver, supra note 1, at 22; National Threat Assessment Center, supra note 1, at 15-17; Kelty, S. F., Hall, G., O'Brien-Malone, A., “You Have to Hit Some People! Endorsing Violent Sentiments and the Experience of Grievance Escalation in Australia,” Psychiatry, Psychology and Law 19, no. 3 (2012): 299-313, at 300, 311.
Google Scholar | Crossref | ISI3. See Silver, supra note 1 at 21.
Google Scholar4. Chester, D.S., DeWall, C.N., “The Pleasure of Revenge: Retaliatory Aggressions Arises from a Neural Imbalance toward Reward,” Social Cognitive and Affective Neuroscience, 11, no. 7 (2016): 1173-1182, at 1178-80;

Google ScholarStrobel, A., Zimmermann, J., Schmitz, A., Reuter, M., Lis, S., Windmann, S. S., Kirsch, P., “Beyond Revenge: Neural and Genetic Bases of Altruistic Punishment,” NeuroImage 54 (2011): 671-680, at 677-879;

Google ScholarSinger, T., Seymour, B., O'Doherty, J.P., Stephan, K.E., Dolan, R.J., Frith, C.D., “Empathic Neural Responses are Modulated by the Perceived Fairness of Others,” Nature 439 (2006): 466-69, at 467;

Google Scholarde Quervain, D.J.F., Fischbacher, U., Treyer, V., Schellhammer, M., Schnyder, U., Buck, A., Fehr, E., “The Neural Basis of Altruistic Punishment,” Science 305 (2004): 1254-1258, at 1256, 1258.
Google Scholar | Crossref | Medline | ISI

5. Volkow, N., Koob, G., McLellan, A.T., “Neurobiologic Advances from the Brain Disease Model of Addiction,” New England Journal of Medicine 374, no. 4 (2016): 363-371, at 364-367.
Google Scholar | Crossref | Medline | ISI6. See id., at 363.
Google Scholar7. Hedegaard, H., Miniño, A. M., Warner, M., “Drug Overdose Deaths in the United States, 1999-2018,” Centers for Disease Control, National Center for Health Statistics, Data Brief No. 356 (2020): at 1.
Google Scholar8. U.S. Department of Justice — Federal Bureau of Investigation , “Uniform Crime Report: Crime in the United States, 2018” (Fall 2019) at 2;

Google ScholarMorgan, R.M., Oudekerk, B.A., “Criminal Victimization, 2018,” U.S. Department of Justice, Office of Justice Programs, Bureau of Justice Statistics Bulletin NCJ 253043 (September 2019): at 11-12.
Google Scholar

9. See Silver, supra note 1, at 21-22; National Threat Assessment Center, supra note 1, at 15-16.
Google Scholar10. See Centers for Disease Control and Prevention, supra note 1.
Google Scholar11. Anderson, C.A., Bushman, B.J., “Human Aggression,” Annual Review of Psychology 53 (2002): 27-51, at 37;

Google ScholarGilligan, J. Violence: Our Deadly Epidemic and Its Causes (G. P. Putnam: New York, 1996): at 11-12, 18-19.
Google Scholar | Crossref

12. Langhinrichsen-Rohling, J., McCullars, A., Misra, T.A., “Motivations for Men and Women's Intimate Partner Violence Perpetration: A Comprehensive Review,” Partner Abuse 3 no. 4 (2012): 429-468 at 459.
Google Scholar | Crossref13. Copeland-Linder, N., Johnson, S.B., Haynie, D.L., Chung, S., Cheng, T.L., “Retaliatory Attitudes and Violent Behaviors among Assault-Injured Youth,” Journal of Adolescent Health 50 no. 3 (2012): 215-220, at 218;

Google ScholarFluck, J. , “Why Do Students Bully? An Analysis of Motives Behind Violence in Schools,” Youth & Society 49 no. 5 (2014): 567-587, at 575, 578-579.
Google Scholar | SAGE Journals | ISI

14. Papachristos, A.V., Hureau, D.H., Braga, A.A., “The Corner and the Crew: The Influence of Geography and Social Networks on Gang Violence,” American Sociological Review 78, no. 3 (2013): 417-447 at 420-21, 438-39;

Google ScholarJacobs, B.A., Wright, R., Street Justice: Retaliation in the Criminal Underworld (Cambridge University Press: New York, 2006): at 1-8.
Google Scholar | SAGE Journals

15. Pathé, M.T., Haworth, D.J., Goodwin, T., Holman, A.G., Amos, S., Winterbourn, P., Day, L., “Establishing a Joint Agency Response to the Threat of Lone Actor Grievance-Fueled Violence,” The Journal of Forensic Psychiatry & Psychology 29, no. 1 (2017): 37-52 at 39, 46, 48.
Google Scholar | Crossref16. D'Souza, A., Weitzer, R., Brunson, R.K., “Federal Investigations of Police Misconduct: A Multi-City Comparison,” Crime, Law and Social Change 71 (2019): 461-482 at 474, 477;

Google ScholarUildriks, N., van Reenen, P., “Human Rights Violations by the Police,” Human Rights Review 2 no. 2 (2001): 64-92, at 67-71.
Google Scholar | Crossref

17. Ghatak, S., Prins, B. C., “The Homegrown Threat: State Strength, Grievance, and Domestic Terrorism,” International Interactions, 43 no. 2 (2017): 217-247, at 217-18, 223, 240;

Google ScholarSchmid, A.P. The Routledge Handbook of Terrorism Research (Routledge: New York, 2011): at 6.
Google Scholar | Crossref

18. Matejkowski, J.C., Cullen, S.W., Solomon, P.L., “Characteristics of Persons with Severe Mental Illness Who Have Been Incarcerated for Murder,” Journal of the American Academy of Psychiatry and the Law 36, no. 1 (2008): 74-86, at 80;

Google ScholarSkeem, J.L., Schubert, C., Odgers, C., Mulvey, E.P., Gardner, W., Lidz, C., “Psychiatric Symptoms and Community Violence among High-Risk Patients: A Test of the Relationship at the Weekly Level,” Journal of Consulting and Clinical Psychology 74, no. 5 (2006): 967-979, at 973-974.
Google Scholar | Crossref | Medline

19. See Silver et al., supra note 1, at 22.
Google Scholar20. See Kelty et al., supra note 2, at 300, 311.
Google Scholar21. See D'Souza et al., supra note 16, at 474.
Google Scholar22. See Chester et al., supra note 4, at 1178-1180.
Google Scholar23. See Strobel et al., supra note 4, at 677-879.
Google Scholar24. See Singer et al., supra note 4, at 467.
Google Scholar25. See de Quervain et al., supra note 4, at 1256, 1258.
Google Scholar26. See Strobel, supra note 4, at 679; Crockett, M.J., Apergis-Schoute, A., Herrmann, B., Lieberman, M.D., Müller, U., Robbins, T.W., Clark, L., “Serotonin Modulates Striatal Responses to Fairness and Retaliation in Humans,” Journal of Neuroscience 33 no. 8 (2013): 3505-3513, at 3510-3512;

Google ScholarChester, D.S., DeWall, C.N., Derefinko, K.J., Estus, S., Peters, D. R., Jiang, Y., “Looking for Reward in All the Wrong Places: Dopamine Receptor Gene Polymorphisms Indirectly Affect Aggression Through Sensation-Seeking,” Social Neuroscience 11, no. 5 (2016): 487-494, at 487.
Google Scholar | Crossref | Medline

27. Grant, J.E., Potenza, M.N., Weinstein, A., Gorelick, D. A., “Introduction to Behavioral Addictions,” American Journal of Drug and Alcohol Abuse 36, no. 5 (2010): 233-241, at 234.
Google Scholar | Crossref | Medline | ISI28. American Society of Addiction Medicine, Board of Directors , “Definition of Addiction” (adopted September 15, 2019), available at <https://www.asam.org/Quality-Science/definition-of-addiction> ().
Google Scholar29. American Psychiatric Association , Diagnostic and Statistical Manual of Mental Disorders: 5th ed. (American Psychiatric Association: Washington, D.C., 2013): at 585-89.
Google Scholar | Crossref30. Petry, N. M., Zajac, K., Ginley, M. K., “Behavioral Addictions as Mental Disorders: To Be or Not To Be?” Annual Review of Clinical Psychology 14 (2018): 399-423, at 400.
Google Scholar | Crossref | Medline31. See Grant supra note 27, at 234.
Google Scholar32. Robbins, T.W., Clark, L., “Behavioral Addictions,” Current Opinion in Neurobiology 30 (2015); 66-72 at 66; Grant supra note 27, at 234.
Google Scholar | Crossref | Medline | ISI33. Yau, Y.H.C., Potenza, M.N., “Gambling Disorder and Other Behavioral Addictions: Recognition and Treatment,” Harvard Review of Psychiatry 23, no. 2 (2015): 134-146, at 138; Robbins, supra note 32, at 69.
Google Scholar | Crossref | Medline | ISI34. See Yau, supra note 33; Robbins, supra note 32, at 68; Grant, supra note 27, at 235.
Google Scholar35. See Silver supra note 1, at 21.
Google Scholar36. Corner, E., Gill, P., Schouten, R., Farnham, F., “Mental Disorders, Personality Traits, and Grievance-Fueled Targeted Violence: The Evidence Base and Implications for Research and Practice,” Journal of Personality Assessment 100, no. 5 (2018): 459-470, at 461.
Google Scholar | Crossref | Medline37. Crockett, M.J., Özdemir, Y., Fehr, E., “The Value of Vengeance and the Demand for Deterrence,” Journal of Experimental Psychology: General 143, no. 6 (2014): 2279-2286, at 2284.
Google Scholar | Crossref | Medline38. Bushman, B.J., Baumeister, R.F., Phillips, C.M., “Do People Aggress to Improve Their Mood? Catharsis Beliefs, Affect Regulation Opportunity, and Aggressive Responding,” Journal of Personality and Social Psychology 81, no. 1 (2001): 17-32, at 28-29.
Google Scholar | Crossref | Medline | ISI39. Golden, S.A., Heins, C., Venniro, M., Aprioli, D. C, Zhang, M., Epstein, D., Shaham, Y., “Compulsive Addiction-Like Aggressive Behavior in Mice,” Biological Psychiatry 82, no. 4 (2017): 239-248, at 246-47.
Google Scholar | Crossref | Medline40. See Grant supra note 27, at 237.
Google Scholar41. Liu, J., Lewis, G, Evans, L., “Understanding Aggressive Behaviour across the Lifespan,” Journal of Psychiatric and Mental Health Nursing 20, no. 2 (2013): 156-168, at 158.
Google Scholar | Crossref | Medline42. Kandel, D., Kandel, E., “The Gateway Hypothesis of Substance Abuse: Developmental, Biological and Societal Perspectives,” Acta Paediatrica 104, no. 2 (2015): 130-137, at 135-136.
Google Scholar | Crossref | Medline43. Yoshimura, S. , “Goals and Emotional Outcomes of Revenge Activities in Interpersonal Relationships,” Journal of Social and Personal Relationships 24, no. 1 (2007): 87-98, at 92-93.
Google Scholar | SAGE Journals | ISI44. Gottfredson, M.R., Hirschi, T., A General Theory of Crime (Stanford University Press: Stanford, CA, 1990): at 41, 83-89.
Google Scholar45. Denson, T.F., DeWall, C.N., Finkel, E.J., “Self-Control and Aggression,” Current Directions in Psychological Science 21, no. 1 (2012): 20-25, at 22.
Google Scholar | SAGE Journals | ISI46. Papachristos, A.V., Wildeman, C., Roberto, E. “Tragic, But Not Random: The Social Contagion of Nonfatal Gunshot Injuries,” Social Science & Medicine 125 (2015): 139-150, at 140.
Google Scholar | Crossref | Medline | ISI47. See Papachristos, supra note 46, at 148.
Google Scholar48. See Chester, supra note 4, at 1179; Golden, supra 39, at 246-247.
Google Scholar49. See Petry, supra note 30, at 404-405; Yau, supra note 33, at 137-139; Grant, supra note 27, at 236; U.S. Office of National Drug Control Policy, National Drug Control Strategy (2019), at 11-12.
Google Scholar50. See Petry, supra note 30, at 404-405; Yau, supra note 33, at 138; Grant, supra note 27, at 237.
Google Scholar51. Rowe, M., Kimmel, J., Pavlo, A. J., Antunes, K.D., Bellamy, C.D., O'Connell, M.J., Ocasio, L., Desai, M., Bal, J., Flanagan, E., “A Pilot Study of Motive Control to Reduce Vengeance Cravings,” Journal of the American Academy of Psychiatry and the Law 46, no. 4 (2018): 486-497;

Google ScholarKimmel, J.P. Suing for Peace: A Guide for Resolving Life's Conflicts (without Lawyers, Guns, Or Money) (Charlottesville, VA: Hampton Roads Publishing Company, 2005): at 84-102.
Google Scholar

52. See Rowe, supra note 51, at 494.
Google Scholar53. Bellamy, C., Kimmel, J., Costa, M.N., Tsai, J., Nulton, L., Nulton, E., Kimmel, A., Aguilar, N., Clayton, A., O'Connell, M., “Peer Support on the ‘Inside and Outside’: Building Lives and Reducing Recidivism for People with Mental Illness Returning from Jail,” Journal of Public Mental Health 18, no. 3 (2019): 188-198, at 190-91.
Google Scholar54. Noar, S.M., Chabot, M., Zimmerman, R.S., “Applying Health Behavior Theory to Multiple Behavior Change: Considerations and Approaches,” Preventive Medicine 46, no. 3 (2008): 275-280, at 278-79;

Google ScholarBernhardt, J.M. , “Communication at the Core of Effective Public Health,” American Journal of Public Health 94, no. 2 (2004): 1251-1253, at 2052.
Google Scholar | Crossref | Medline

55. Wakefield, M.A., Loken, B., Hornik, R.C., “Use of Mass Media Campaigns to Change Health Behaviour,” The Lancet 376, no. 9748 (2010): 1261-1271, at 1268;

Google ScholarCenters for Disease Control Task Force on Community Services , “Effectiveness of Universal School-Based Programs to Prevent Violent and Aggressive Behavior: A Systematic Review,” American Journal of Preventive Medicine 33, no. 2 (2007): S114-S129, at S118-S124; Yau, supra note 33, at 140-41.
Google Scholar | Crossref | Medline | ISI

56. Corrigan, P.W. , “Mental Health Stigma as Social Attribution: Implications for Research Methods and Attitude Change,” Clinical Psychology: Science and Practice 7, no. 1 (2000): 48-67.
Google Scholar | Crossref |