David Graham: “As Trump himself observed, he’s been on a particularly bleak and disturbing tear, even by his own standards. I wrote late last year about how Americans have become understandably desensitized to his most extreme rhetoric, at the same time that he has taken a darker tone. Now he’s well past that level with barely a month to go before the election.” “Picking the lowlight of the past few days isn’t easy, but it’s probably Trump’s suggestion that one hour of widespread, extrajudicial violence by the police would be an effective method of crime control.