In June of !"#$, following the assassinations of Martin Luther King, Jr., and Robert F. Kennedy, President Lyndon Johnson set up the National Commission on the Causes and Prevention of Violence. A task force made up of academics studied killings, attempted killings, and assaults on eighty-one state legislators, congressmen, senators, governors, and Presidents, dating back to !$%&. Their findings presented a discordant medley: cases involving mentally disturbed people, extremists, and terrorists; political grievances that escalated; and one incident, in !$"', in which a journalist shot and killed a congressman who had been harassing him. Over all, attacks on politicians seemed to spike in times of social instability, such as during Reconstruction.
Last week, James Hodgkinson, who was sixty-six, and had recently expressed anger toward President Trump and the Republican Party,…