It's not that black and white. Governments accumulate debt during downturns, that's expected. There are key questions like how much debt should be accumulated, for how long should government run deficits, and what should the money be spent on in order to get the best ROI. Another question to answer is how will the government unwind the debt after the economy recovers, and what interest will the government have to pay on the debt.
The interest on our national debt is currently running about 400 billion a year. By the time Obama's first term is over, it'll likely be pushing towards around 750 billion a year. The federal government only takes in about 2.4 trillion annually. (It is currently slated to spend over 4.2 trillion in 2011!)
Krugman says we need to deficit spend to get out of this, but really, we already are by a factor of two, and because we've been doing this for so long we're approaching a maximum limit, a point of no return where interest potentially outstrips revenue.
That's why a recovery by business, even a jobless one, with increased profitability, would be of benefit. More tax revenue for the government. Deficit reduced. That's the theory.
