It is never wise to ignore market, economic or voter sentiment. Discount it, yes. Put it into broader context, for sure. But ignore it at your peril. As too many retailers, fund managers and politicians have discovered, the public is often a good barometer of what is occurring in the broader economy.

But not always: the public can be fickle. People are subject to all manner of cognitive biases that affect their objectivity and thought processes. There are times when sentiment is very much at odds with economic data.

That has been the anomaly for much of the past seven years or so. It demands an explanation.

Four recent articles had me thinking about this over the weekend. Running through all of these was the curious thread of negativity at odds with other, more constructive data. This has been fairly common since the financial crisis. At risk of channeling the sort of “mental recession" error made by former U.S. Senator Phil Gramm, let’s explore how and why that might be, via these four items.

The first was an article by Bloomberg News' Tracy Alloway and Luke Kawa about the people who write for the website Zero Hedge. (Zero Hedge’s response is here). It’s a terrific story about a site that has at times provided insight on derivatives, hedge funds and high frequency trading. Outside of those market-structure issues, however, the rest of the content is “radically bearish market views.”

That bearishness is worth noting in the context of everything else that has occurred. It seems the higher equity markets went, the more bearish some market observers have become. Matt Egan of CNN Money summed this up in 2014, observing that “Even though stocks have zoomed to record highs since Zero Hedge launched in 2009, the site continues to hold serious sway among hedge funds, traders and others in finance. That's because Zero Hedge's dark perspective has struck a chord with the sizable portion of the public who remain deeply skeptical of the stock market and economy.”

You have to wonder. Are these hedge funds, traders and others in finance already bearish, and seeking out views that agree with their investment outlook? If so, that is a classic case of confirmation bias. Perhaps they are still suffering from the trauma of the 2008-09 crisis? We know from past research that crashes can haunt investors for decades. The recency effect creates a fear of what just happened -- especially big traumatic events. No wonder so many investors fear another financial crisis. Maybe that’s at work here.

That leads us to the second news item: Warren Buffett calling the fees that hedge funds have been paid for mediocre results "unbelievable."  “There’s been far, far, far more money made by people in Wall Street through salesmanship abilities than through investment abilities,” Buffett said Saturday during Berkshire Hathaway’s annual meeting in Omaha, Nebraska.

Have a look at the chart from Bianco Research of hedge fund returns compared with the Standard & Poor's 500 Index and the Barclays/Lehman Aggregate Bond Index. The underperformance of hedge funds is stunning -- and this is before fees, which would make the returns look even worse. Perhaps it's more than just an interesting coincidence that the rise of Zero Hedge’s popularity and its radical bearishness coincides with the collapse of hedge fund performance. Zero Hedge and whatever insight one can get from it probably isn't the cause of that underperformance. However, the Internet has created an environment where interesting, persuasive -- and money-losing -- commentary is but a single click away.

In an earlier era, there were plenty of cranks and quacks. However, you had to actively seek them out; they didn't show up in the first page of your Google search results. Modern technology has given us easy access to oddball or fringe sentiment. In the era before the Internet, the equivalents of Zero Hedge had a much smaller megaphone.

If confirmation bias is driving some hedge-fund managers, perhaps we need to ask what is driving angst among employees. This was the third news item that caught my own confirmation bias over the weekend -- a recent report which found U.S. workers were the happiest they’ve been in a decade. This stands in contrast to the image we commonly get of workplace conditions. Certainly dissatisfaction with the job market has been a critical narrative as this election cycle plays out.