Things are never as we expect. Who would have imagined that people would just walk away from the overvalued homes. No wonder the ratings agency models have had nervous breakdowns.

Fitch Ratings, while telling investors last Friday to expect additional "widespread and significant downgrades" on $139 billion worth of subprime loans, has cited a new factor in their "worsening performance."

"The apparent willingness of borrowers to 'walk away' from mortgage debt," the analysts noted, "has contributed to extraordinary high levels of early default" on loans issued during the 18 months before the mortgage bubble burst. It expects losses to reach 21% of initial loan balances for subprime mortgages issued in 2006 and 26% for those issued in early 2007.

Such behavior, where not precipitated by willful fraud, shows that American homebuyers supposedly duped by their lenders aren't so dumb. They're perfectly capable of acting rationally without political interference.