This can’t-accept-defeat mentality began in earnest before the 2016 election, which Mr. Trump said was rigged even after he won, and it has set the tone for all that has come since. It emboldened the absurd and dangerous campaign of lies about election fraud in 2020, which notably focused on the big cities where larger numbers of Black voters live. It led directly to the deadly Jan. 6 riot that Mr. Trump incited at the U.S. Capitol. And it continues to infect the party 10 months later, as top Republicans still refuse to acknowledge Mr. Biden as the legitimately elected president and Republican-led states pass laws to make it easier for their legislatures to overturn the will of the voters if they don’t like the result.

Speaking of election fraud, Republicans have been strangely quiet on the topic this time around. Interesting how that works: When a Democrat wins, it’s ipso facto proof of fraud. When a Republican wins — presto! — the election is on the level. This is how so many top Republicans managed to keep a straight face in 2020 as they argued that votes for Mr. Biden were fraudulent even while votes for winning Republican candidates farther down the same ballot were magically untainted.

Hey, Republicans! This does not have to be so hard. All you have to do is value American democracy more than you value your own party’s hold on power. I guarantee that Democrats want to win just as badly as you do, and yet they take their lumps like grown-ups.