In the aftermath of the mass shootings in Aurora, Colo.; Newtown, Conn.; Tucson, Ariz.; Virginia Tech; the Washington Navy Yard; and sadly, other locales, conventional wisdom held that the epidemic of mass shootings was a problem of gun control. I wrote columns attempting to draw attention to the mental health system in America that so wrongheadedly fails to treat the dangerous mentally ill.

Now, at last, the mental health angle on mass shootings has become conventional wisdom — just in time, perhaps, to be wrong again.