This is the way the euro ends — not with a bang but with bunga bunga. Not long ago, European leaders were insisting that Greece could and should stay on the euro while paying its debts in full. Now, with Italy falling off a cliff, it’s hard to see how the euro can survive at all.

But what’s the meaning of the eurodebacle? As always happens when disaster strikes, there’s a rush by ideologues to claim that the disaster vindicates their views. So it’s time to start debunking.

First things first: The attempt to create a common European currency was one of those ideas that cut across the usual ideological lines. It was cheered on by American right-wingers, who saw it as the next best thing to a revived gold standard, and by Britain’s left, which saw it as a big step toward a social-democratic Europe. But it was opposed by British conservatives, who also saw it as a step toward a social-democratic Europe. And it was questioned by American liberals, who worried — rightly, I’d say (but then I would, wouldn’t I?) — about what would happen if countries couldn’t use monetary and fiscal policy to fight recessions.

So now that the euro project is on the rocks, what lessons should we draw?

I’ve been hearing two claims, both false: that Europe’s woes reflect the failure of welfare states in general, and that Europe’s crisis makes the case for immediate fiscal austerity in the United States.