Agree wholeheartedly, although the analogies are more difficult. An ideological purity test is going to be messy... but it's been tried before. See party "loyalty oaths" in Germany and Russia and China.
Oh, I'm not suggesting any such thing. The only way to combat bad ideas is with good ideas. "Political Correctness" and "Non Judgementalism" are bad ideas that are intended to make it more difficult for good ideas to propagate.
What I'm saying - and not very well - is that the ecological system of ideas, and the mechanisms that have been developed by civilization for finding the truth, defending the truth, and purging anti-truths (superstitions, lies, propaganda, etc.) are under attack.
Political correctness/nonjudgementalism is an attack on the basic act of generalization. "Prejudice" is simply a word that is applied to a type of generalization that one group or another doesn't like. P-C is an attack on all generalization, which makes it an attack on one of the basic modalities of human intellectual activity in the search of knowledge and insight, and the survival value those things confer.