Last week the European Commission confirmed what everyone suspected: the economies it surveys are shrinking, not growing. It’s not an official recession yet, but the only real question is how deep the downturn will be.

And this downturn is hitting nations that have never recovered from the last recession. For all America’s troubles, its gross domestic product has finally surpassed its pre-crisis peak; Europe’s has not. And some nations are suffering Great Depression-level pain: Greece and Ireland have had double-digit declines in output, Spain has 23 percent unemployment, Britain’s slump has now gone on longer than its slump in the 1930s.

Worse yet, European leaders — and quite a few influential players here — are still wedded to the economic doctrine responsible for this disaster.

For things didn’t have to be this bad. Greece would have been in deep trouble no matter what policy decisions were taken, and the same is true, to a lesser extent, of other nations around Europe’s periphery. But matters were made far worse than necessary by the way Europe’s leaders, and more broadly its policy elite, substituted moralizing for analysis, fantasies for the lessons of history.