Why it's often a good idea to 'play' at being a doctor
Adapting to patients' expectations can be a crucial part in securing their trust
Back in the day when witch doctors were a thing, it was impossible not to spot which person in a tribal community was playing that role.

Marshall McLuhan.
The elaborate costume, the bizarre headpiece, the archetypal make-up, was probably not worn by the medicine man simply for the purpose of mystically enhancing their powers.
Witch doctors