Stop Blaming Mental Illness

Alan L. Leshner
Photo by Joseph Rodriguez/

From Science 16 Aug 2019: Vol. 365, Issue 6454, pp. 623, doi: 10.1126/science.aaz0997. Reprinted with permission from AAAS

The United States is experiencing a public health epidemic of mass shootings and other forms of gun violence. A convenient response seems to be blaming mental illness; after all, “who in their right mind would do this?” This is utterly wrong. Mental illnesses, certainly severe mental illnesses, are not the major cause of mass shootings. It also is dangerously stigmatizing to people who suffer from these devastating disorders and can subject them to inappropriate restrictions. According to the National Council for Behavioral Health, the best estimates are that individuals with mental illnesses are responsible for less than 4% of all violent crimes in the United States, and less than a third of people who commit mass shootings are diagnosably mentally ill. Moreover, a large majority of individuals with mental illnesses are not at high risk for committing violent acts. Continuing to blame mental illness distracts from finding the real causes of mass shootings and addressing them directly.

Mental illness is, regrettably, a rather loosely defined and loosely used term, and this contributes to the problem. According to the American Psychiatric Association, “Mental illnesses are health conditions involving changes in emotion, thinking or behavior…associated with distress and/or problems functioning in social, work or family activities.” That broad definition can arguably be applied to many life stresses and situations. However, what most people likely mean when they attribute mass shootings to mental illness are what mental health professionals call “serious or severe mental illnesses,” such as schizophrenia, bipolar disorder, or major depression. Other frequently cited causes of mass shootings—hate, employee disgruntlement, being disaffected with society or disappointed with one’s life—are not defined clinically as serious mental illnesses themselves. And because they have not been studied systematically, we do not know if these purported other causes really apply, let alone what to do about them if true.

Unfortunately, it has been difficult to determine precisely the causes of mass shootings and the appropriate approaches to preventing them, largely because of a dearth of public funding for this line of research. The U.S. Centers for Disease Control and Prevention (CDC) had historically been the major funder of the public health aspects of firearm-related violence research, and much was being learned. But in 1996, Congress passed the so-called “Dickey Amendment” to the appropriations bill for the CDC, which was interpreted by the agency as prohibiting support for any firearm-related studies, and therefore the agency stopped funding this research. Although agencies including the National Institutes of Health (NIH) and the National Science Foundation have devoted small amounts to studies related to firearm violence, Congressional actions over the last few years have discouraged such investment, and both agencies have virtually stopped funding that kind of work.

There is now a new opportunity to apply science to the problem of mass shootings. In June 2019, the funding bill passed by the U.S. House of Representatives included $50 million for the Department of Health and Human Services, split between the NIH and CDC, to support research on firearm violence. It is not a lot of money, given the scope of the problem, but surely a start. The Institute of Medicine and the National Research Council (now parts of the National Academies of Sciences, Engineering, and Medicine) laid out a detailed research agenda in 2013 for investigating firearm-related violence that could easily be updated. The Senate and the White House should agree to this funding bill, and the country should stop scapegoating people who suffer from mental illnesses and get on with determining the real causes of mass shootings.



An often ignored source of funding for studying the criminal use of firearms is the National Institute of Justice.

People disagree about the approaches and assumptions embraced and advanced when gun crime, and sometimes gun ownership, are depicted, promoted, and researched as disease or a health issue.

But plenty of funding exists to study the issue, through more relevant organizations like NIJ.

You are right to point out that, given the data, it is inaccurate and dangerous to blame mental illness.

Credible data also makes it clear how is inaccurate and dangerous it is to blame gun crimes on ‘assault rifles’.

Perhaps research funding should be directed toward studying theoretically plausible causes other than these.

Thank you for offering your article. I enjoyed reading it.

-Daniel R. Smith, Ph.D

Thank you for this Alan–this article is an example of the kind of leadership the country longs for–Let’s continue to get this story in the NEWS!

Thank you Alan. If your statistics are correct, that means 96% of violent crimes are committed by individuals who do not meet the criteria for mental illness. Research is long overdue.

Thanks Alan for your Article and I hope most of people have been helped by this explanation. Because some of us in this world we can’t think before we blame someone has a metal sick who doing something wrong to us. But the first reaction that we response to that person to criticize him/her. Last reaction is to destroy him/she. I think by reading your article and it is true and also a lesson to help those people have been involved in sickness of mind.

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