An attempt to classify all of humanity as 'Mentally Ill' !??

You are correct. As a student of medicine, and health care in general. I was disgusted by the symptoms of "mental illnesses".
Here are some symptoms, I will let you infer the "diseases"
Overly good mood, pessimistic, selfish, lethargic...and many other things that humans transiently experience.

Medication can be used to subdue, domesticate, and essentially control. Look back to the mid-1900's. Mental institutions were established and any social deviants were committed. Experiments at that time (brain resections/excisions) provided medical students and current health care providers the knowledge of the function of the frontal cortex, hippocampus, amygdala, and so on.