O.K., here it comes: The unthinkable is about to become the inevitable.

Last week, Robert Rubin, the former Treasury secretary, and John Lipsky, a top official at the International Monetary Fund, both suggested that public funds might be needed to rescue the U.S. financial system. Mr. Lipsky insisted that he wasn’t talking about a bailout. But he was.

It’s true that Henry Paulson, the current Treasury secretary, still says that any proposal to use taxpayers’ money to help resolve the crisis is a “non-starter.” But that’s about as credible as all of his previous pronouncements on the financial situation.

So here’s the question we really should be asking: When the feds do bail out the financial system, what will they do to ensure that they aren’t also bailing out the people who got us into this mess?

Let’s talk about why a bailout is inevitable.

Between 2002 and 2007, false beliefs in the private sector  the belief that home prices only go up, that financial innovation had made risk go away, that a triple-A rating really meant that an investment was safe  led to an epidemic of bad lending. Meanwhile, false beliefs in the political arena  the belief of Alan Greenspan and his friends in the Bush administration that the market is always right and regulation always a bad thing  led Washington to ignore the warning signs.