A weird thing happened right after the Nov. 3 election: nothing.

The nation was braced for chaos. Liberal groups had vowed to take to the streets, planning hundreds of protests across the country. Right-wing militias were girding for battle. In a poll before Election Day, 75% of Americans voiced concern about violence.

Instead, an eerie quiet descended. As President Trump refused to concede, the response was not mass action but crickets. When media organizations called the race for Joe Biden on Nov. 7, jubilation broke out instead, as people thronged...