Here are the rules from DU. Guess “God Bless Rush” was offensive?:
Content: Do not post messages that are inflammatory, extreme, divisive, incoherent, or otherwise inappropriate. Do not engage in anti-social, disruptive, or trolling behavior. Do not post broad-brush, bigoted statements. The moderators and administrators work very hard to enforce some minimal standards regarding what content is appropriate. But please remember that this is a large and diverse community that includes a broad range of opinion. People who are easily offended, or who are not accustomed to having their opinions (including deeply personal convictions) challenged may not feel entirely comfortable here. A thick skin is necessary to participate on this or any other discussion forum.
Gosh, according to their own rules, 99% of their posts break their own rules...