The BBC appears to be upset that more and more people are reacting to mass killings by wanting to improve our public mental health care policies instead of with more gun control.

In fact, few mass killers actually suffer from a diagnosable, serious mental illness such as schizophrenia, bipolar disorder and psychotic spectrum disorders. A 2004 analysis of more than 60 mass murders in North America, for example, found that just 6% were psychotic at the time of the killings. And when it comes to mass shootings, those with mental illness account for “less than 1% of all yearly gun-related homicides”, a 2016 study found. Other studies indicate that people with mental disorders account for just 3-5% of overall violence in the US, (much lower than the prevalence of mental illness in the general population – up to 18%) which “still leaves you with around 96% of violence, even if you’re able to eliminate all people with mental disorders”, Appelbaum points out.

[…]

Moreover, much of the violence that people with serious mental illnesses commit are minor infractions, such as verbal assault or hitting, not homicide (suicide, however, is a significant problem), and such infractions tend to be directed at those the perpetrator lives with, not at strangers and not at a mass scale. Large attacks also require a level of planning and organisation that often defies many with serious mental illness. A 2014 study, for example, found that just 2% percent of 951 patients discharged from a psychiatric hospital committed a violent act involving a gun, and just 6% committed a violent act involving a stranger.

That knee-jerk conclusion is problematic, he continues, because it encourages even more stigmatisation of people who have a mental illness, many of whom already have extremely difficult lives and already face discrimination in several areas, namely housing, jobs, and relationships. Individuals suffering from mental illnesses are actually three times more likely than the average person to be victims of violence, as they are more vulnerable.

 […]

Making this inaccurate link can also shift the focus of policy debates in the US. In debates over limiting access to firearms, some people start talking about fixing the mental healthcare system instead. “Suddenly you hear the gun lobby – which is very powerful in this country and has a vested interest in not having guns be regulated – become an advocate for better mental health care in America,” Swanson says. “It’s a distraction so we don’t talk about guns.” (Read more: “What if all guns disappeared?”)

It’s difficult to psychologically profile mass shooters because they often commit suicide or are killed during their attack. But what doctors and scientists do know is that the perpetrators of such events are frequently angry young men, who feel they have been mistreated by society and therefore seek to extract revenge.