By denigrating several of the signal achievements of modern American society, including the Civil Rights Act of 1964 and the Fair Housing Act, Rand Paul has performed a useful service for voters who are angry at their elected officials. He has helped to illuminate the limits and the hazards of antigovernment sentiment.

Many Americans are sputtering mad, believing that government has let them down in abetting a ruinous recession, bailing out bankers and spending wildly. But is Rand Paul really the remedy they had in mind? His views and those of other Tea Party candidates are unintentional reminders of the importance of enlightened government.

In a handful of remarkably candid interviews since winning Kentucky’s Republican Senate primary this week, Mr. Paul made it clear that he does not understand the nature of racial progress in this country.

As a longtime libertarian, he espouses the view that personal freedom should supersede all government intervention. Neighborhood associations should be allowed to discriminate on the basis of race, he has written, and private businesses ought to be able to refuse service to anyone they wish. Under this philosophy, the punishment for a lunch counter that refuses to seat black customers would be public shunning, not a court order.