If PC mean "Polite and Compassionate" we'd all be better off. What I mean is this. If you are simply polite and compassionate to another's situation good things usually happen.
Being PC can go too far and ultimately be controlling. Why do we have to agree? Why can't we just appreciate the other perspective and be generally polite about it. However it shouldn't mean that I must change my opinion.
For those that feel they can just say what they want whenever they want that usually works out for them until their on the other end of the offensive comment.