Well, I don't want to get into a debate here, too.

But my general thinking is along the lines that the wiki is a community wiki...it is, after all, linked to from the forums and HLP page, both of which are sort of the hub of the community. Because of that, I think that things with (at least) relevance to the community and Freespace, or to canon Freespace (since that makes it automatically relevant for a Freespace community

), should be in the wiki.
I don't think that miscellaneous things like the Shivan Manifesto can be excluded with that definition, because the only way to do that would be based on arbitrary judgements (ie the only fanon things that can be in the wiki are campaigns and mods, websites, "FS lingo", documentation of SCP features, guides on SCP, the "Introduction to FSSCP" article, etc etc). I've also gotten accustomed to looking in the wikipedia for things IRL that may be totally fictitious, and it's useful for them to be there because it gives context to when people talk about them. Even if it is something that I think is total crap. So I can see how having something that's factually inaccurate but still discussed in the community would be useful, as long as the article itself is factually accurate.
So, IMHO, the wiki should have non-canon information unless it is split up/made into a separate project, like the old FS encyclopedia project (FSURP, was it?).