Are There Hidden Psychological Causes of Political Correctness It is an important feature of 'political correctness' that it is not a 'movement' (for want of a better word) initiated by oppressed groups but by intellectuals and academics on behalf of these groups (whether they wanted it or not). It was rooted in a kind of revivalist logical positivism that, contrary to Wittgenstein, deemed words inflexible carriers of historical social and cultural prejudice. You may think you are using a term in a perfectly friendly, non-judgemental way, but PC argued, you are, by definition, wrong. Judgement is inherent in the term no matter the context in which it is used.
And so we had the often totally illogical kind of revisionism that turned 'handicapped' into 'disabled' (despite many people's feeling that the latter was actually less accurate and more disparaging) and 'spastic' into 'suffering cerebral palsy' evolving eventually into the awful blanket term 'special' (a corruption of 'with special needs'?) Negro became black (?) or African American (??) and so on. You'll have your own opinion as to the true value of this but it was not long before PC started going mad! And always at the hands of the wise on behalf of the oppressed (or the seemingly oppressed) who still hadn't really decided whether they needed it or not.
That has since evolved to the point where a kind of professionally offended and highly vocal elite microcensors every article written, every speech made, every political decision, indeed every stray thought that sees the light of day often to the excruciated embarrassment of those on whose behalf they claim to be acting and the rage of those who consider themselves falsely 'accused' as the very wide brushes that this elite employs tar everyone!
So, to get back to the original question, I do not think it fruitful to go looking for psychological explanations for PC other than the comfort of identity and the simple belief that you are morally correct which is pretty much a given for any and all social, cultural, political and religious groups. There is plenty for philosophers to get stuck into in what is believed without the distraction of personal motivations for believing it!