@DiscoBiscuit, @Tellenbach Take a look at this, guys: BBC News - Bristol school apology after UKIP appears in far-right list
The real point we should take from the article is that children are being taught that certain political views are unacceptable from a very early age. This is what really frustrates me; not allowing people to grow and make their own decisions. You can imagine how the hive here would react if only the names of the groups listed were replaced with, say, Islamic ones, and similar reasoning was given.
Therefore, I believe that the main motivation for political correctness is not justice (however misguided), but fear. The fear that history might repeat itself, and that their vision is fundamentally irrational and cannot be realised without coercion. I can sense that the liberal establishment is dripping wet with these neuroses.