Because nobody has added the other theories? No one has added a criticism section? I wrote the article to present the document as neutrally as possible, ie to just summarize the document and make it clear that it isn't canon and isn't generally accepted as canon by the community. OTOH throwing on a criticisms section opens the actual pages up to debate and discussion, which has typically been the purview of the forum, rather than just information on pertinent topics. Wikipedia's done it though, so beyond that small thought I've got no argument if someone wants to go in and highlight the holes in the theory.
AFAIK Wikipedia doesn't print fiction in what is effectively a factual entry (as opposed to, say, storylines of books and movies or the background of fictional charatcers and places, etc), but with a 'this is not fact' disclaimer. Moreso, the issue of what is and what is not fair criticism is something that would inevitably result in a pseudo-edit war. And it the purview of the forum, as you point out.
Also, why should we be obliged to add all theories to the wiki? Because that's the only fair way of dissemination, given the wikis' reference/factual purpose.
As for giving it a veneer of acceptance over others, it's hard to make other theories seem as impressive as the Manifesto because it's put together so well. Most of the Shivan Manifesto builds upon itself, while other theories I've seen are very selective and just extrapolate one conclusion from one set of circumstances.
It builds upon false or unproveable assumptions garnished as fact; moreso these are IMO very misleading and likely to send people in the wrong way. Frankly, I don't find it a particularly impressive theory; there are gigantic holes within it, and I've seen a number of far better thought out theories from other campaigns
I guess I'm just having trouble seeing how including this in a reference document where it's easy to get to if someone is curious about it makes it any more official. It's like arguing that because the Christianity page in the Wikipedia is so long, while a Russian cult isn't even mentioned, that the Wikipedia is endorsing Christianity. No, mostly it just means that there are people that were willing to go to the trouble and add it, because more people in general do support Christianity.
We're not talking about length competition between 2 factual entries though; we're talking about a fictional construct. The wiki is a reference source; it is not a dumping ground for postulation or ideas - the forum is. Why not go the whole hog and have people submit their ideas as wikipedia articles rather than forum threads?
The wiki, IMHO, should not be playing at deciding what is and what isn't...it should just be a repository of information regarding FS. A reference document, if you will.
Information being the key word. Fiction (within the context of fact within the fictional Freespace universe being the canonical evidence) is not information, as it is not informative.
Also, it's valid to have entries on the storyline of the likes of TVWP because of context; it's a description of that campaign or mods fictional universe - what it is not, is an invention purely for the purposes of display, as the SM is. It's like, we can have (in the 'main' wikipedia) descriptions of the FS2 universe, but not descriptions of a made up universe that exists only as an abstract and unused construct.
The SM is simply not of worthwhile reference; it has a welter of problems that, unless contested, can lead to similarly false assumptions being made. I've already seen fallacities within it being quoted as if it was canon. Moreso, it's validity is something that should be discussed in the forums, alongside every other theory. I should not have to type up a 29 page PDF just to ensure equal reference within what is suppossed to be a respository of reference information - i.e. fact.