At its most basic, “political correctness” is an oppressive form of “etiquette”. In fact it has pretty much replaced the word “etiquette” - you hardly ever see that used much any more.
Etiquette was basically a set of unwritten rules for social engagement and acceptable language developed over time that aided in a more harmonious coexistence. They were not enforced by laws but by peer pressure. If you constantly broke those rules you would be shunned by polite society.
PC also defines what is permissible in polite society, but the rules are not set by the broad society over time, instead they are defined by “activists” and their propaganda organs (the media) and more often than not are made into laws that carry some type of legal punishment.
A variation on this theme is the Overton Window.
My definition of the Overton Window is any political view that is permitted in Wikipedia.
Another definition might be any view of any topic that is permitted at elite cocktail parties.
True status seekers and social climbers are very careful never to voice an opinion on any topic outside of the window.
That makes them useless drones for the Cabal who seeks to control speech and thought of the masses.
BS
You have stated the blind, the cover, the hoax being perpetrated.
Political correctness is purely a method of capturing the language and thus the minds and thus the mindset of the citizenry.
Being one of the gullibly masses, you have been duped