Is there any reason to believe that the dozen companies Welch looked at are representative of the US economy as a whole? Is Welch really saying that looking at these 12 companies gives a better insight into the economy than the official establishment survey, which looks at 141,000 businesses covering 486,000 different worksites? And that aside, if businesses were indeed hiring again, and using their cashflow to employ people rather than just sending it into an ever-growing bank account, you’d expect their profits to go down rather than up. Welch didn’t say that the companies he looked at weren’t hiring; he just said they were making less money in net profit. Which could well be a positive sign.

Welch has statistical-methodology quibbles, too; these are nothing new. Indeed, as he points out in his column, as long ago as 2003 Austan Goolsbee was explaining in the NYT how Democrats and Republicans both have swelled the rolls of the disabled, with the effect that millions of people don’t turn up any more in the official unemployment rate. If you’re collecting disability, you don’t count as unemployed — and the number of people collecting disability today is much greater than it was 30 years ago. As a result, it’s difficult to compare today’s unemployment rate with 1982′s.

But that kind of stats geekery will never set off the kind of Twitter firestorm that greeted Welch on Friday. The slanderous part of Welch’s tweet was his assertion that the White House both could and did “change the numbers” for political gain. Not change the methodology, in some kind of public manner which statisticians could argue about — but instead pull some kind of shady Chicago political move, and release headline unemployment rate just under 8% in much the same way that Welch would regularly release earnings a penny above expectations.

And on that front, Welch is not apologizing in the slightest. Instead, he’s just grudgingly diluting the suggestion a tiny bit:

If I could write that tweet again, I would have added a few question marks at the end, as with my earlier tweet, to make it clear I was raising a question.

Does he have any evidence that the Chicago guys might be manipulating data? No. Does he think it’s even possible for the Chicago guys to be manipulating the data? Evidently, he does. What makes him say that? He won’t say. But is it a legitimate question to raise? In Welch’s eyes, absolutely, yes. If you’re Jack Welch, it seems, any time there’s US data which makes the government look good, the question can and probably should be raised: might the data be wrong? Or, might the government be manipulating it?

The paranoid style in American Politics is nothing new: it was famously diagnosed by Richard Hofstadter in 1964. It has a storied and ignoble history, and Welch is merely the latest in a very long line of American conspiracists. (And yes, of course, you can count Donald Trump in as a bedfellow.) Sometimes the paranoiacs are mostly on the left; these days, they’re mostly on the right. But as with all conspiracy theories, nothing they say can ever be constructive: these are people who will attack empirical evidence long before they use it to help shape their view of the world.

And so, with one unretracted tweet, Welch has effectively rendered himself irrelevant in the so-called thought-leadership world he has dominated for so long. It’s fine to have unusual or minority opinions. What’s not fine is to base those opinions on nothing but ideology, and admit of nothing which could make you change your mind. At that point, you’re not a thinker any more; you’re a theologian. Welch has clearly decided that he would much rather be a pastor, preaching to a like-minded flock of WSJ op-ed page dogmatists, than a participant in substantive debate. The sad thing is that he received much more attention for his outbreak of crazy than he received in response to any of his less-bonkers pronouncements. Which is probably only going to encourage him, going forwards.

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Felix Salmon is an Audit contributor. He's also the finance blogger for Reuters; this post can also be found at Reuters.com.