Much as it pains me to say it, President Trump is dead wrong about the issue of mental illness in the wake of mass shootings, stating that long-stay psychiatric hospitals, which are necessary for those with intents to harm themselves or others, were emptied out and closed in the 1960s for budgetary reasons. It did happen, but it was called "deinstitutionalisation," at the time. It occurred not primarily for cost-saving reasons, but largely because of "a series of socio-political movements that campaigned for patient freedom." I first heard Mr. Trump say what he did about the costs of those closings...