“It reignites the terror in the souls of Black folks when we witness these killings of our people without trial, without jury, without adjudication,” one psychologist said. In the moments before New York City subway entertainer Jordan Neely was killed on an F train in lower Manhattan in the middle of the day, a witness said he had been yelling, asking for food and saying that he didn’t care if he went to jail. For Donald Grant, a clinical psychologist in Los Angeles, the deadly act represents a white vigilantism that has become an ever-present threat to Black Americans, manifested...