Political correctness is just a politically correct way of saying CENSORSHIP.
Regarding the DU website. While I understand the desire to incite debate and to raise the blood pressure of the opposition, I believe it is a waste of time.
At this point in history you would be better served by spending your time shooting, learning new skills, tactical training, physical training and networking with other folks of like minds.
Things are going to get worse, much worse in the next 4 - 8 years. Use what time you have to ensure you can protect yourself, your family and whatever circle of friends you have that may be worth fighting for.
Lastly, a consertvative may be able to quote the Constitution, but whether they adhere to it is another matter (think drug war, asset forfeiture, "reasonable restrictions" on guns, the USA PATRIOT act, foreign aid...)