The unemployment rate no longer seems to reflect America’s mood. Friday’s strong jobs report showed that the jobless rate—the most closely watched gauge of the economy’s health—is down to 5.8 percent. A year ago, the rate was 7.2 percent. Five years ago, it was 10 percent. It’s the kind of sustained decline that would normally suggest a satisfied public. Not so much anymore. […] Many Americans don’t feel they've benefited from falling unemployment any more than they have from a sustained rise in the stock market or from solid U.S. economic growth. Some hints of their discontent can be found...