As if to symbolize just how out of touch Trumpism is here and in much of America, a sole woman approached the makeshift memorial at the Walmart where 22 people died. She wore a bright red MAGA hat, and quickly over 30 people surrounded her chanting: “Take it off! Take it off!” She refused, yelling back that the president should be accepted here — only to be drowned out. Later, young people appeared, dressed in black, chanting: “white violence, White House.”

Something is shifting. Mr. Trump may not have felt it during his few hours in town, but walking around, you couldn’t miss it. The El Paso massacre brought together the most active of America’s shifting tectonic plates: racism, assault weapons, a national Latino population of 60 million now with a target on its back, Mr. Trump’s white nationalism and his awful manners for a country in mourning.

Another president might have been sensitive enough to sense the shift, and changed course accordingly — played the convener, the unifier. Instead, Mr. Trump displayed just how small he is, no matter how big his mouth or powerful his office. He never once appeared in public. By 6:01 p.m., after just a little more than two hours, he was safely aboard Air Force One again and it was wheels up into the sky. But he is a shrinking president, stuck in a racist past, flying over a changing America. And I think we — or most of us — are all El Paso now.