Among the myriad headlines that roiled the nation last week, rising political violence in the United States was a sickening drumbeat—one that culminated and resounded most loudly during a weekend of targeted shootings directed at two Minnesota state lawmakers and their spouses. Though the shooter’s motivations are still unconfirmed, news reports reveal that notebooks found in his car were “full of plans, lists of names, surveillance efforts and home addresses.” Among those listed are ...