Edgar Allan Pillow
Ero-Sennin
On the contrary, its a way for groups to reclaim the power associated with terms they have historically felt are discriminatory. And those that complain about PC are generally expressing their frustration that they can't use racially or sexually charged terminology in public settings as they once could years ago. Just yesterday here in the States, Curt Schilling got the sack after reposting a meme mocking transgenders in North Carolina. People are just coming to grips with the reality that they can no longer get away with mocking certain groups in public or on social media, as they once could. These instances aren't supposed to deflect from the underlying problem or cure it completely, they are intended to seize the narrative away from those who discriminate and towards those who reject discriminatory language.
I just wrote that big post refuting the 1st line and disputing the "PC"ness of the examples you've offered before. None of the examples you listed even remotely does what you say here. Comments on that?
As for Schilling, he was discriminatory he suffered the consequences. If you are saying PC is just a 'catch all' for non-discriminatory, non-bigotry etc etc I fail to see why we need that term at all. It's just redundant. Use 'anti-discriminatory' or 'Inclusive' or 'anti-Bigotry' or similar as they are more precise, clear and addresses precisely what you want to convey.
Saying "I do not discriminate" is waaaaay better and simpler than saying "I'm Politically Correct", which sounds so cover your ass'y.