...are best taken up with the site's owners. In any case, they are spelled out fairly clearly in the rules.
Restrictions on Linking to Other Websites
Do not post messages that give publicity to websites that have little purpose other than to smear, disrupt, or complain about Democratic Underground. Currently there are only three websites that fall into this category. Their addresses are not listed here because we do not wish to give them publicity. They are easily identified by their bizarre obsession with Democratic Underground.
Do not quote or link to bigoted websites, or websites that republish content from bigoted websites. While many of these websites are easily identifiable, some are less obvious at first glance. Please be aware that even some anti-Bush websites also include bigoted content and are therefore not welcome here.
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http://www.democraticunderground.com/forums/rules_detailed.htmlAnd no, it is not censorship when a privately owned website disallows certain forms of speech. Moving away from DU for a moment, let's take my website as an example. I construct (it's a never ending process), run and pay for Neural Gourmet. Do I not have a right to determine what forms of speech
I deem acceptable at my website? Why should I allow something I consider offensive to be posted on my site when I'm the one who is fronting the financial and legal risks for that speech?
Or on another front, is it censorship when DU bans right wing trolls? There are a certain group of well known right wing trolls who claim exactly that.