Like the Smithsonian National Museum of Natural History, the Newseum – Washington's museum dedicated to journalism – displays dinosaurs.

On a long wall near the entrance, the front pages of newspapers from around the country are electronically posted each morning – the artifacts of a declining industry. Inside, the high-tech exhibits are nostalgic for a lower-tech time when banner headlines and network news summarized the emotions and exposed the scandals of the nation. Lindbergh Lands Safely. One Small Step. Nixon Resigns. Cronkite removes his glasses to announce President Kennedy's death at 1 p.m., Central Standard Time.

Behind a long rack of preserved, historic front pages, there is a kind of journalistic mausoleum, displaying the departed. The Ann Arbor News, closed July 23 after 174 years in print. The Rocky Mountain News, taken at age 150. The Seattle Post-Intelligencer, which passed quietly into the Internet.

What difference does this make? For many conservatives, the "mainstream media" is an epithet. Didn't the Internet expose the lies of Dan Rather? Many on the left also shed few tears, consuming their partisanship raw in the new media.

But a visit to the Newseum is a reminder that what is passing is not only a business but also a profession – the journalistic tradition of nonpartisan objectivity. Journalists, God knows, didn't always live up to that tradition. But they generally accepted it, and felt shamed when their biases or inaccuracies were exposed.

The profession had rules about facts and sources – and editors who enforced standards. At its best, the profession of journalism has involved a spirit of public service and adventure – reporting from a bomber during a raid in World War II, or exposing the suffering of Sudan or Appalachia, or rushing to the site of 9/11 moments after the buildings fell.

By these standards, the changes we see in the media are also in decline. Most cable news networks have forsaken objectivity and produce little actual news, since makeup for guests is cheaper than reporting. Most Internet sites display a hunger to comment and little appetite for verification.

Free markets, it turns out, often make poor fact-checkers, instead feeding the fantasies of conspiracy theorists from "birthers" to 9/11 "truthers." Bloggers in repressive countries often show great courage, but few American bloggers have the resources or inclination to report from war zones, famines and genocides.

The democratization of the media – really its fragmentation – has encouraged ideological polarization. Princeton University professor Paul Starr traced this process recently in the Columbia Journalism Review. After the captive audience for network news was released by cable, many Americans did not turn to other sources of news. They turned to entertainment. The viewers that remained were more partisan.

Cable and the Internet now allow Americans, if they choose, to get their information entirely from sources that agree with them.

And the whole system is based on a kind of intellectual theft. Internet aggregators (who link to news they don't produce) and bloggers would have little to collect or comment upon without the costly enterprise of newsgathering and investigative reporting. The old media dinosaurs remain the basis for the entire media food chain. But newspapers are now expected to provide their content free on the Internet. A recent poll found that 80 percent of Americans refuse to pay for Internet content. There is no economic model that will allow newspapers to keep producing content they don't charge for, while Internet sites repackage and sell content they don't pay to produce.

I dislike media bias as much as the next conservative. But I don't believe that journalistic objectivity is a fraud. I was a journalist for a time, at a once-great news magazine. I've seen good men and women work according to a set of standards I respect – standards that serve the public. Professional journalism is not like the buggy-whip industry, outdated by economic progress, to be mourned but not missed. This profession has a social value that is currently not reflected in its market value.

What is to be done? A lot of good people are working on it. But if you currently have newsprint on your hands, thank you.

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Michael Gerson is distributed by the Washington Post Writers Group.