As an uneasy March unspooled, as coronavirus dread descended upon the United States, it became commonplace — and, for public figures, quite practical — to point out how, unlike most major events in the 21st century, this was an unusually communal moment.

There is power and authority in invoking shared experience, whether it comes from the president ("We are all in this together"), the governor of New York ("Nobody's alone. We are all in the same situation") or a random Pittsburgh disc jockey ("Everybody's in the same boat").

Even while at odds, Americans crave shared experiences — an understan...