“Fed shrugged as subprime crisis spread,” was the headline on a New York Times report on the failure of regulators to regulate. This may have been a discreet dig at Mr. Greenspan’s history as a disciple of Ayn Rand, the high priestess of unfettered capitalism known for her novel “Atlas Shrugged.”

In a 1963 essay for Ms. Rand’s newsletter, Mr. Greenspan dismissed as a “collectivist” myth the idea that businessmen, left to their own devices, “would attempt to sell unsafe food and drugs, fraudulent securities, and shoddy buildings.” On the contrary, he declared, “it is in the self-interest of every businessman to have a reputation for honest dealings and a quality product.”

It’s no wonder, then, that he brushed off warnings about deceptive lending practices, including those of Edward M. Gramlich, a member of the Federal Reserve board. In Mr. Greenspan’s world, predatory lending  like attempts to sell consumers poison toys and tainted seafood  just doesn’t happen.

But Mr. Greenspan wasn’t the only top official who put ideology above public protection. Consider the press conference held on June 3, 2003  just about the time subprime lending was starting to go wild  to announce a new initiative aimed at reducing the regulatory burden on banks. Representatives of four of the five government agencies responsible for financial supervision used tree shears to attack a stack of paper representing bank regulations. The fifth representative, James Gilleran of the Office of Thrift Supervision, wielded a chainsaw.

Also in attendance were representatives of financial industry trade associations, which had been lobbying for deregulation. As far as I can tell from press reports, there were no representatives of consumer interests on the scene.

Two months after that event the Office of the Comptroller of the Currency, one of the tree-shears-wielding agencies, moved to exempt national banks from state regulations that protect consumers against predatory lending. If, say, New York State wanted to protect its own residents  well, sorry, that wasn’t allowed.

Of course, now that it has all gone bad, people with ties to the financial industry are rethinking their belief in the perfection of free markets. Mr. Greenspan has come out in favor of, yes, a government bailout. “Cash is available,” he says  meaning taxpayer money  “and we should use that in larger amounts, as is necessary, to solve the problems of the stress of this.”

Given the role of conservative ideology in the mortgage disaster, it’s puzzling that Democrats haven’t been more aggressive about making the disaster an issue for the 2008 election. They should be: It’s hard to imagine a more graphic demonstration of what’s wrong with their opponents’ economic beliefs.