Healy stressed that serotonin is not irrelevant but it raises a question about the significance doctors have put on biological and epidemiological plausibility.

Healy suggested that the myth "co-opted" many, including the complementary health market, psychologists, and journals. But above all the myth co-opted doctors and patients, he said; for doctors it provided an easy short hand for communication with patients.
For patients, the idea of correcting an abnormality has a moral force that can be expected to overcome the scruples some might have had about taking a tranquilizer, especially when packaged in the appealing form that distress was not a weakness, he further added.
Source-ANI