“Words,” wrote John Maynard Keynes, “ought to be a little wild, for they are the assault of thoughts on the unthinking.” I’ve always loved that quote, and have tried to apply it to my own writing. But I have to admit that in the long slump that followed the 2008 financial crisis — a slump that we had both the tools and the knowledge to end quickly, but didn’t — the unthinking were quite successful in fending off unwelcome thoughts.

And nowhere was the triumph of inanity more complete than in Keynes’s homeland, which is going to the polls as I write this. Britain’s election should be a referendum on a failed economic doctrine, but it isn’t, because nobody with influence is challenging transparently false claims and bad ideas.

Before I bash the Brits, however, let me admit that we’ve done pretty badly ourselves.

It began very early. President Obama inherited an economy in free fall; what we needed, above all, was more spending to support demand. Yet much of Mr. Obama’s inaugural address was given over to boilerplate about the need to make hard choices, which was the last thing we needed right then.

It’s true that in practice Mr. Obama pushed through a stimulus that, while too small and short-lived, helped diminish the depth and duration of the slump. But when Republicans began talking nonsense, declaring that the government should match the belt-tightening of ordinary families — a recipe for full-on depression — Mr. Obama didn’t challenge their position. Instead, within a few months the very same nonsense became a standard line in his speeches, even though his economists knew better, and so did he.