The Texas mass shooter, like the one in Las Vegas, was not a minority or a muslim. That means, according to Trump and his Republican cohorts, that nothing can be done except to offer "thoughts and prayers". If it had been a minority doing the shooting, they would be calling for more restrictive laws against minorities -- and if it had been a muslim, they would be calling for banning more muslims from entering the country. But it was a white man, so they just shrug their shoulders and blame it on mental illness (ignoring the facts that they are the party that cut funding for helping the mentally ill, and passed legislation allowing them to buy firearms).
It's convenient for Republicans to blame mass shootings by whites on mental illness, because it means they don't have to take any action to stop the killings. But there is a problem with that accusation -- it's just not true. Consider this article by Laura L. Hayes at Slate.com. I post only a part of that article below.
In the wake of a string of horrific mass shootings by people who in many cases had emotional problems, it has become fashionable to blame mental illness for violent crimes. It has even been suggested that these crimes justify not only banning people with a history of mental illness from buying weapons but also arming those without such diagnoses so that they may protect themselvesfrom the dangerous mentally ill. This fundamentally misrepresents where the danger lies.
Violence is not a product of mental illness. Nor is violence generally the action of ordinary, stable individuals who suddenly “break” and commit crimes of passion. Violent crimes are committed by violent people, those who do not have the skills to manage their anger. Most homicides are committed by people with a history of violence. Murderers are rarely ordinary, law-abiding citizens, and they are also rarely mentally ill. Violence is a product of compromised anger management skills.
In a summary of studies on murder and prior record of violence, Don Kates and Gary Mauser found that 80 to 90 percent of murderers had prior police records, in contrast to 15 percent of American adults overall. In a study of domestic murderers, 46 percent of the perpetrators had had a restraining order against them at some time. Family murders are preceded by prior domestic violence more than 90 percent of the time. Violent crimes are committed by people who lack the skills to modulate anger, express it constructively, and move beyond it.
The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, the reference book used by mental health professionals to assign diagnoses of mental illness, does very little to address anger. The one relevant diagnosis is intermittent explosive disorder, a disorder of anger management. People with IED tend to come from backgrounds in which they have been exposed to patterns of IED behavior, often from parents whose own anger is out of control. But the DSM does not provide a diagnostic category helpful for explaining how someone can, with careful advance planning, come to enter an elementary school, nursing home, theater, or government facility and indiscriminately begin to kill.
Violent crimes committed by people with severe mental illnesses get a lot of attention, but such attacks are relatively rare. Paolo del Vecchio of the federal Substance Abuse and Mental Health Services Administration has said, “Violence by those with mental illness is so small that even if you could somehow cure it all, 95 percent of violent crime would still exist.” A 2009 study by Seena Fazel found a slightly higher rate of violent crime in schizophrenics—but it was almost entirely accounted for by alcohol and drug abuse. Likewise, the MacArthur Violence Risk Assessment Study found that mentally ill people who did not have a substance abuse problem were no more violent than other people in their neighborhoods.
With no clear explanation of the causes of violent crime from the mental health field, and with significant encouragement from the gun lobby, the public has begun to seize on the wrong explanation for tragic, violent events. They focus not on the IED-diagnosed patients but on those with other diagnoses, schizophrenia in particular, ignoring the fact that what the perpetrators have in common in every single one of these cases is a loss of control of their anger.
The attribution of violent crime to people diagnosed with mental illness is increasing stigmatization of the mentally ill while virtually no effort is being made to address the much broader cultural problem of anger management. This broader problem encompasses not just mass murders but violence toward children and spouses, rape, road rage, assault, and violent robberies. We are a culture awash in anger.