PC is interesting - originally a liberal way of cutting down on offensive language (good manners), and has been taken over by the extremists, partly liberal but mainly conservatives, who are using PC to force thinking into very narrow channels.
a quite interesting comparison in this respect is my experience in DK - danes are far more likely to use perjoritive language about 'physically and mentally disadvantaged people', or spastics as they used to be called. The danes, even liberal ones, will openly use the term 'spazzers'in public with no shame, no PC fear that others will call down social retribution upon their head.
yet the odd thing is that danish society is far more open with 'spazzers', and its very common to see them on the streets being taken out by their family, far more so than it is in the UK which has far stronger social restrictions upon them (presumably cultural ones? I dont think the UK govt has passed laws banning them from british streets... but you can never be sure here

).
so it seems counter-intuitive - the danes are far freer about terms of abuse, and (on this topic) are far less PC than the english, yet they give their 'physically and mentally disadvantaged people' far more humanity than the english do.
which makes me:
1. remember the optimen in frank herberts "eye of heisenberg", and their manipulation of language to hide basic truths from themselves,
2. wonder about the link between shame, thought, and PCness.
personally i think PC was created by unemployable, crack smoking niggas and permanently unemployed council house working class lesbian single mother beggars. Who smoke.
fucking spastics.