It is possible to speak truthfully without being a total jerkoff. If you speak the truth & are a jerkoff... you're still speaking the truth, but you usually offend everyone around you... not because of what you said, but because of how you said it.
If you speak the truth, but make just a little bit of effort, the point still comes across, but without the disdain that comes along with the offensiveness that being a jerkoff causes. That's not PC. That's manners.
(hm... as I'm listening to myself here, a picture of me being a jerkoff on 200 just flashed through my head ~ sorry about that. Yes, I'm a jerkoff more than I should be)
PC, on the other hand, I see more as appeasement (sorry, too lazy to go into something different for a spell-check). Doesn't necessarily mean PC is the truth ~ but it's what everyone wants to hear in an effort to make sure everyone comes out even ~ the total dive off the cliff of 'bread n jam for francis,' everyone comes out even, nobody gets to be placed above or below anyone else.