It is a history of coded race-baiting combined with myopia and cowardice that puts the Republican establishment in lock step now with the alt-right, the Ku Klux Klan, the racists and misogynists and nut jobs, the guy who shouts “Jew-S.A.,” the crowds that scream, “Lock her up.” For some it is taxes, abortion or immigration, for many it is simply Clinton hatred that allows them to justify supporting a candidate who also stands for torture, reckless war, unchecked greed, hatred of women, immigrants, refugees, people of color, people with disabilities. A sexual predator, a business fraud, a liar who runs on a promise to destroy millions of immigrant families and to jail his political opponent.

If Mr. Trump is rejected on Tuesday, the nation will have a momentary breather. And some good news to build on. The Republicans who have spent the last weeks and months jumping on, then off, then on the Trump bus will have been discredited, and some may be unseated. Those in the Trump inner circle will be freshly disgraced, and perhaps go away — like Rudy Giuliani, former New York mayor, now Mr. Trump’s conspiracy ghoul, and Gov. Chris Christie of New Jersey, who has been separately brought low in an unrelated courtroom drama. And the electorate will have demonstrated its decency.

The rejection of Trump is the simple part. Win or lose, the harder job will be confronting the conditions that spawned him. This country’s problems will still be deep and complex, and the Republicans in Congress show no signs of giving Mrs. Clinton any more respect than they gave President Obama, or of abandoning their jihad against responsible governing. If she wins, Mrs. Clinton will have the burden of managing the jihadis, while governing for the benefit not only of her supporters but also of the tens of millions who will have voted for Mr. Trump expecting — against all evidence — that he will make everything better. It won’t be easy.

“Winter Is Coming” is the title Garry Kasparov gave his book about Vladimir Putin. Autumn is here in the United States, too. It’s time to focus. To confront what Trump represents, the better to end it. Let this election have the salutary effect of reminding Americans as a nation of who we are, and the good we can do, when we are put to the test.