The key is to put the diagnosis into the hands of the State and it's "experts," which means the power to institutionalize people for "being sad" and "having insomnia" becomes an arbitrary fiat power. Living under a totalitarian government that was never elected can do that to a person so eventually this diagnosis can apply to anyone at random.
If you get this stage consolidated you are now ready to do as the Soviet Union did and pop dissidents out of bed in the middle of the night and commit them involuntarily "for their own good."
It is believed that the Soviet psychiatry system performed upwards of 80,000 lobotomies for purely political reasons.
First you get the power to diagnose unchallenged.
Then you get the power to commit unchallenged.
Then you get the power to "cure" unchallenged (drill out their frontal lobes.)
What lays the groundwork for this sort of madness is a parlor psychology spearheaded by television hosts like Oprah and Dr. Phil. All of the prerequisites make what follows seem like a natural extension of the "therapy" that is to be imposed. I firmly believe that Oprah and then Dr. Phil's careers were funded and promoted for the very purpose of normalizing this insane marxist bullsh*t.