Political Correctness is, as you might expect, a contentious issue. The phrase means different things to different people. Trying to summarise it succinctly is no doubt going to exclude the psychological angle, or the socio-political angle, or is going to be far too shallow for linguists.
It’s one of those subjects that can involve experts from very different fields who all see it through different prisms.
George HW Bush On Political Correctness (Part 1 Of 3):
Alan Whicker On Duvalier:
Political Correctness Gone Mad – Psychology Today
Political correctness: how the right invented a phantom enemy – The Guardian