Political correctness is iron fascism wrapped in a glove of velvety politeness. It serves to limit expression and limit the scope of the debate. In democracies we often see the allowance of vociferous, loud debate, but ONLY within a certain set of parameters. Go outside of those parameters and people are conditioned to jump all over you (political correctness being one of the tools for this assault.)

In Canada, for example, any criticism of zionism yields immediate cries of anti-semitism. I think it is actually illegal to criticize Islam here, now. People are being threatened with jail sentences for speaking their mind. A properly oriented society would be going the opposite way: welcoming all opinions... perhaps not accepting them, but certainly not too scared to even HEAR them. We can't have that though, because if the average person was ever exposed to what seekers/searchers/conspiracy theorists all know (generally), the control mechanisms would fail.