Three days after the Jan. 6 anniversary, with its indelible images of costumed rioters running amok in the Capitol, former President Jimmy Carter’s funeral service in the National Cathedral presented a historical picture of a different kind, one that spoke not of upended norms, but of preservation and strength.

One of the first calls Obama made after U.S. forces killed Osama bin Laden in 2011 was to George W. Bush to spread the word that the mission had been accomplished, said Kate Andersen Brower, author of “Team of Five: The Presidents Club in the Age of Trump.”