An obvious one drops out if you take apart the term "politically correct" itself and think about it: the value that people should independently make their own j

An obvious one drops out if you take apart the term "politically correct" itself and think about it: the value that people should independently make their own judgements, potentially against pressure to conform. That's incompatible because political correctness requires conformity; either to a political authority or a zeitgeist, from which an individual is not allowed to stray far.