Let’s be concrete here. There’s a reasonable chance  not a certainty  that Citi and BofA, together, will lose hundreds of billions over the next few years. And their capital, the excess of their assets over their liabilities, isn’t remotely large enough to cover those potential losses.

Arguably, the only reason they haven’t already failed is that the government is acting as a backstop, implicitly guaranteeing their obligations. But they’re zombie banks, unable to supply the credit the economy needs.

To end their zombiehood the banks need more capital. But they can’t raise more capital from private investors. So the government has to supply the necessary funds.

But here’s the thing: the funds needed to bring these banks fully back to life would greatly exceed what they’re currently worth. Citi and BofA have a combined market value of less than $30 billion, and even that value is mainly if not entirely based on the hope that stockholders will get a piece of a government handout. And if it’s basically putting up all the money, the government should get ownership in return.

Image Paul Krugman Credit... Fred R. Conrad/The New York Times

Still, isn’t nationalization un-American? No, it’s as American as apple pie.

Lately the Federal Deposit Insurance Corporation has been seizing banks it deems insolvent at the rate of about two a week. When the F.D.I.C. seizes a bank, it takes over the bank’s bad assets, pays off some of its debt, and resells the cleaned-up institution to private investors. And that’s exactly what advocates of temporary nationalization want to see happen, not just to the small banks the F.D.I.C. has been seizing, but to major banks that are similarly insolvent.