No job at all better than a bad job?

I newly released study suggests the above to be true, at least as it relates to your mental health.  Everybody has heard of the detrimental effects on self-esteem, image, self-worth, etc., that not being employed has on a person.  However, this study suggests that those who have horrible, demoralizing jobs are mentally better off without a job at all:  http://www.cnn.com/2011/HEALTH/03/14/unemployment.health/index.html.