Think of the possibilities here. Trolling is supposedly a sign of a severe mental problem. If they could actually establish that then all that remains is to redefine trolling as disputing whatever PC dogma is being discussed and voila! You have an entirely new weapon against dissident speech.
Sounds very USSR-like indeed. Anyone who couldn’t understand the “benefits of communism” or rejected atheism in favor of religion got labeled “mentally ill” and was sent to the special doctors.