For three years and more, policy debate in Washington has been dominated by warnings about the dangers of budget deficits. A few lonely economists have tried from the beginning to point out that this fixation is all wrong, that deficit spending is actually appropriate in a depressed economy. But even though the deficit scolds have been wrong about everything so far — where are the soaring interest rates we were promised? — protests that we are having the wrong conversation have consistently fallen on deaf ears.

What’s really remarkable at this point, however, is the persistence of the deficit fixation in the face of rapidly changing facts. People still talk as if the deficit were exploding, as if the United States budget were on an unsustainable path; in fact, the deficit is falling more rapidly than it has for generations, it is already down to sustainable levels, and it is too small given the state of the economy.

Start with the raw numbers. America’s budget deficit soared after the 2008 financial crisis and the recession that went with it, as revenue plunged and spending on unemployment benefits and other safety-net programs rose. And this rise in the deficit was a good thing! Federal spending helped sustain the economy at a time when the private sector was in panicked retreat; arguably, the stabilizing role of a large government was the main reason the Great Recession didn’t turn into a full replay of the Great Depression.

But after peaking in 2009 at $1.4 trillion, the deficit began coming down. The Congressional Budget Office expects the deficit for fiscal 2013 (which began in October and is almost half over) to be $845 billion. That may still sound like a big number, but given the state of the economy it really isn’t.