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Remember that someone who would rather have a regular job but works one day a week at TGI Chillibees counts as employed for statistical purposes.
From anecdotal experience the underemployment rate is high - there are plenty of people that would like to have a full-time job but are making do as adjuncts.
The adjunct cancer has spread to places that you thought were immune. Look at Vassar College, it's a respectable place. In the Chemistry Department there are ten tenure-track professors, one full-time lecturer, and five adjuncts. Villanova, another respectable institution, is looking to fill three adjunct positions to teach graduate level courses. They do it because they can. There are sufficient pharmco refugee candidates around Philly and Boston from the last round of mergers and acquisitions for the model to work.