On Thursday, the European Central Bank announced a series of new steps it was taking in an effort to boost Europe’s economy. There was a whiff of desperation about the announcement, which was reassuring. Europe, which is doing worse than it did in the 1930s, is clearly in the grip of a deflationary vortex, and it’s good to know that the central bank understands that. But its epiphany may have come too late. It’s far from clear that the measures now on the table will be strong enough to reverse the downward spiral.

And there but for the grace of Bernanke go we. Things in the United States are far from O.K., but we seem (at least for now) to have steered clear of the kind of trap facing Europe. Why? One answer is that the Federal Reserve started doing the right thing years ago, buying trillions of dollars’ worth of bonds in order to avoid the situation its European counterpart now faces.

You can argue, and I would, that the Fed should have done even more. But Fed officials have faced fierce attacks all the way. Pundits, politicians and plutocrats have accused them, over and over again, of ‘debasing” the dollar, […]