Mass shootings represent a small percentage of all gun violence, and mental illness is not a factor in most violent acts. According to one epidemiological estimate, entirely eliminating the effects of mental illness would reduce all violence by only 4 percent. Over all, less than 5 percent of gun homicides between 2001 and 2010 were committed by people with diagnoses of mental illness, according to a public health study published this year.
Blaming mental health problems for gun violence in America gives the public the false impression that most people with mental illness are dangerous, when in fact a vast majority will never commit violence.