Protesters against ranked choice voting demonstrate in Westford, Mass., Oct. 31, 2020.

Protesters against ranked choice voting demonstrate in Westford, Mass., Oct. 31, 2020.

Photo: Craig F. Walker/The Boston Globe via Getty Images

When it comes to counting votes, America’s political parties want to keep or gain their own advantage. The public interest, however, demands a nonpartisan method. No neutral method has yet been devised that merely elicits the people’s will without twisting it one way or another. Ranked-choice voting is an attempt that has its own twist and will make elections worse for both parties.

The idea isn’t new but it has gained favor, mostly from the left. It can be dismissed as too complicated and, coming as it does from professors, too demanding for most voters outside New York City. But I would like to present three deeper faults in it that concern how voters think, for ranked-choice voting is intended to make them think in a certain way.

First, by ranking choices a voter is required to divide his vote between a favorite candidate and some merely acceptable ones. The first choice is what the voter privately wills—the representative who suits him best. This choice is not directed at the common good, which requires that voters consider what others want. In a free country voters should desire a common good superior to the wishes of private individuals to prevail.

Ranked-choice voting makes the common good inferior to each person’s private first choice. The common good of the country typically gets ranked second choice or below for each citizen.

Ranked-choice suffuses the spirit of systems where multiple parties vie to build coalitions after votes are cast. In the U.S., parties aspire to gain majorities through the voting rather than by secret, chancy negotiation afterward. Each looks for ways to bring together difficult companions: Republicans must reconcile the interests of evangelical Christians and libertarians; Democrats must balance the desires of progressives and moderates. Ranked-choice voting splits these coalitions and requires the pieces be brought together after the election, and not by voters. In presidential elections, the Electoral College produces a majority intended to recognize the importance of the states, one that sometimes differs from a popular majority. But in any case it is a coalition majority.

Voters in a coalition are reminded that most of them didn’t get what they wanted but avoided what they most disliked. Though this is often true, it should not be the goal. The goal should be a first choice willed as a compromise rather than a first choice abandoned for a compromise. This seemingly slender distinction makes a big difference in common trust and the way Americans think politically.

It is often thought that the sole purpose of an election is to make government accountable to the people and representative of their will. A second fault of ranked-choice voting is that it aims to perfect this idea by offering some success to as many shades of opinion as possible. But another, greater purpose for elections was intended by the Constitution’s framers: to find competent governors.

A good result from an election relies on its accuracy in representing the people’s will. The voters should get not only what they want, like consumers, but also what is good for them as citizens. Competency among those elected is never assured, but it will stand a better chance when voters are selecting the candidate who is best for the job as well as the one most representative of their will. Ranked-choice voting may bring competency along with accuracy, but accuracy is all that is asked for. Again, elections are held not to buy products but to put people in office. Competency ought to include the ability to unite the country in a majority, not just to make pleasing speeches to the voters known as “the base.”

A third fault: Ranked-choice voting rewards extremism in the electorate. Voters who make extreme choices should be punished via exclusion from the majority. Ranked-choice voting rescues them from the penalty they deserve for throwing away their ballot on an extreme first choice. One suspects that progressives like ranked-choice voting because it would allow them to vote twice: once for Bernie Sanders and once for Joe Biden.

Compromise is prudent, but resorting to prudence when first-choice morality seems to fail teaches voters that morality is at the extreme and prudence is strategic. Teaching in a classroom, one could say it combines the worst of Kant and Machiavelli. Outside the classroom one recognizes the pairing, typical in our time, of virtue-signaling with cagey maneuver. Ranked-choice voting gives both morality and compromise a bad name. The better way is to make one’s first choice prudently, thus tempering extremism and promoting compromise.

By the way, a question for progressives: If equity consists in making human beings equal to one another, why is it just or reasonable to rank them?

Mr. Mansfield is a professor of government at Harvard.