Political correctness is "allows the speaker to defend the status quo without engaging in rational argument."
I have been looking around for a good definition of this devious political non-argument for years and this is it, complements of John Compton (here). We are hearing a lot of accusations of "political correctness" from candidates on the right to direct questions that they do not want to answer because the answer--like so many responses from the "faith community"--have no basis in fact. And, as the man once said, "You can't argue faith with fact. Just can't do it."