When I first began writing for The Times, I was naïve about many things. But my biggest misconception was this: I actually believed that influential people could be moved by evidence, that they would change their views if events completely refuted their beliefs.

And to be fair, it does happen now and then. I’ve been highly critical of Alan Greenspan over the years (since long before it was fashionable), but give the former Fed chairman credit: he has admitted that he was wrong about the ability of financial markets to police themselves.

But he’s a rare case. Just how rare was demonstrated by what happened last Friday in the House of Representatives, when  with the meltdown caused by a runaway financial system still fresh in our minds, and the mass unemployment that meltdown caused still very much in evidence  every single Republican and 27 Democrats voted against a quite modest effort to rein in Wall Street excesses.

Let’s recall how we got into our current mess.

America emerged from the Great Depression with a tightly regulated banking system. The regulations worked: the nation was spared major financial crises for almost four decades after World War II. But as the memory of the Depression faded, bankers began to chafe at the restrictions they faced. And politicians, increasingly under the influence of free-market ideology, showed a growing willingness to give bankers what they wanted.