You might remember yesterday–oh, how long ago that seems as events move so quickly–that I suggested that you couldn’t trust the reassurances of either the president or the Treasury Secretary when they say things are under control and the financial system is sound. And so…look at today’s story:

Fearing a financial crisis worldwide, the Federal Reserve reversed course on Tuesday and agreed to an $85 billion bailout that would give the government control of the troubled insurance giant American International Group.

The decision, only two weeks after the Treasury took over the federally chartered mortgage finance companies Fannie Mae and Freddie Mac, is the most radical intervention in private business in the central bank’s history.

With time running out after A.I.G. failed to get a bank loan to avoid bankruptcy, Treasury Secretary Henry M. Paulson Jr. and the Fed chairman, Ben S. Bernanke, convened a meeting with House and Senate leaders on Capitol Hill about 6:30 p.m. Tuesday to explain the rescue plan. They emerged just after 7:30 p.m. with Mr. Paulson and Mr. Bernanke looking grim, but with top lawmakers initially expressing support for the plan. But the bailout is likely to prove controversial, because it effectively puts taxpayer money at risk while protecting bad investments made by A.I.G. and other institutions it does business with.

What frightened Fed and Treasury officials was not simply the prospect of another giant corporate bankruptcy, but A.I.G.’s role as an enormous provider of esoteric financial insurance contracts to investors who bought complex debt securities. They effectively required A.I.G. to cover losses suffered by the buyers in the event the securities defaulted. It meant A.I.G. was potentially on the hook for billions of dollars’ worth of risky securities that were once considered safe.

If A.I.G. had collapsed — and been unable to pay all of its insurance claims — institutional investors around the world would have been instantly forced to reappraise the value of those securities, and that in turn would have reduced their own capital and the value of their own debt. Small investors, including anyone who owned money market funds with A.I.G. securities, could have been hurt, too. And some insurance policy holders were worried, even though they have some protections.

   I bolded the words above to underscore that these guys have no idea what to expect and what will happen. It is the proverbial finger-in-the-dike strategy: plug a hole one place and, bam, another one opens up.

   We–taxpayers–are now on the hook for another $85 billion. You can take all the Congressional earmarks in total and it doesn’t come anywhere close to the cost to us so let’s focus the debate on the right thing.