The political aspect of the president’s failures this week is to reveal him as increasingly isolated. He is not without supporters, but it’s down to roughly a third of the country and one senses soft around the edges. That is not a base, it’s a core. A core can have an impact, but a president cannot govern if that’s all he has. You need something bigger behind you to scare your foes and stiffen your friends. The nation’s CEOs, feeling personal dismay and external pressure, ran for the exits. The president has further embarrassed and frustrated his party on Capitol Hill. That puts in further doubt needed legislation on such popular issues as tax reform and infrastructure, which might fare better if he were not associated with them.

Other fallout the past week is as consequential. Donald Trump is binding himself down with thick cords of rhetorical inadequacy. People felt let down, angry and in some cases frightened by his inability to make clear moral distinctions when he addressed the events in Charlottesville, Va. There were neo-Nazis, anti-Semitic chants, white supremacists; a woman was killed and many people injured. It’s not hard to figure out who and what needed to be castigated—clearly, unambiguously, immediately.

Here is a cliché but only because it is true: In times of stress and fracture, people want a president who’s calm in the storm, who speaks to the nation’s moral conscience, recalls first principles, evokes what unites us, honestly defines the contours of an event, and softly instructs. Mr. Trump did not do any of that. If a leader is particularly gifted he could, in a moment of historical stress, succeed in speaking to the nation’s soul and moving its heart by addressing its brain. This kind of thing comes from love—of the country, our people, what we’ve been. It struck me this week as he spoke that his speeches and statements are peculiarly loveless. The public Mr. Trump is not without sentiment and occasional sentimentality, but the deeper wells of a broader love seem not there to draw from. Seven months in, people know they can look to him for a reaction, a statement, an announcement, but not for comfort, inspiration, higher meaning.

For leadership we turn, as we always do anyway, to each other—to thinkers and respected colleagues, religious figures and neighbors. After the church shootings in Charleston, S.C., two years ago, the great and immediate moral leaders were the victims’ families, whose words at the shooter’s bond hearing spread throughout the country within 24 hours. “I forgive you.” “We are praying for you.” It was the authentic voice of American Christianity, of Wednesday night Bible study, of mercy and self-sacrifice. It quieted the soul of a nation: We’ll be OK. This is who we really are.

Those bereaved relatives never quite got the recognition and thanks they deserved. Their love saved the day.