Financial trust increasing?

The Chicago Booth Kellogg School Financial Trust Index is showing some improvement over the last year. While these numbers are not impressive, it shows that there is a growing comfort with our financial institutions. This improvement suggest that some of the negative rhetoric that has been associated with the post financial crisis environment is starting to decline. Still the trust levels are similar, within 5%, to those found in December 2009. 

The surprising number is the low trust of the stock market. While the market is up substantially in the last three years, retail investors do not have much trust in this key institution.  It is also surprising that banks have the highest trust levels, much higher than large corporations. What happened to the Wall Street versus Main Street divide?