This is a meta-article. It has a small amount of value to Slashdot as content, but then a massive negative value for its nature concerning the gaming of an online community, which Slashdot is.
It'd be like posting a guide to DDOSing vBulletin on a vBulletin forum.
It's fair enough to post the content on a lone website, but not in an online community. You can claim that knowledge of the article is harmless, and will inform the public, but it won't stop people trying to use it as a set of guidelines. And is that worth all of Slashdots time to clean up? No.
But ultimately, it's a private site, they can do what they want. If you don't like it, then go somewhere else.
If you post instructions for an exploit of software X on their own forums, they'll probably remove it. If you post it on a website that doesn't care, you will most likely be "safe" in that the material will not be removed. It would take a federal case to remove that information, if it was illegal.
But some people, it seems, believe that "Freedom of Speech" applies to everyone, as in "If I like X, you shouldn't be able to remove X." Unfortunately, many times, that person dislikes Y and seeks to actively remove Y from any site he's active on through various means -- downvoting, flagging as spam, offensive replies, disinformation, etc. al.
http://www.metafilter.com/118170
Part of the reason it may have been deleted is because it probably has nothing to do with the government, and because as a document, it's been kicking around (and publicly available) for at least 4 years.
I was initially super excited that it was knowledge too powerful even for SlashDot, but the opposite may be true.
Notice all possible outcomes are the result of some grand conspiracy.
Probably see some write up on this experiment in community paranoia late in the year.
http://www.reddit.com/r/technology/comments/wzmdu/censored_s...