Because, what, the IP holders' material is objectively real and true and pure? The delusion is in thinking that having a copyright on something makes the content of the stories more valid.
Because the original material is original, thus the first, and - in combination with its distribution and popularity - what is logically considered to be the common ground between the fans.
You need to stop deluding yourself, and to stop putting words in other peoples' mouth. Again: There is a difference between material being official, material being canon, and material you may consider enjoyable. Nobody forces you to adhere to a specific interpretation of a setting, but that does not make your personal vision official or canonical. These things are not connected. All the entire debate revolves around is a question of standards.
You cannot disclaim responsibility for contributing to something just because you didn't create it from scratch.
I don't. I explicitly said I - and from the looks of it, the majority of fans (which you agreed with!) - are perfectly fine with it. Dig this: I want to contribute.
And my justification is a drive for consistency, a common ground. I have explained this half a dozen times by now, but perhaps you've merely skimmed my posts rather than reading and comprehending them. It would explain how you could consider my stance inconsistent. I don't know what else I could do to explain it, though.
Midichlorians were a deviation.
Midichlorians are an addition.
And you are not referring to audience approval, you are presuming it. I also find it ironic how you claim I'd shove words in your mouth, immediately followed by once again misunderstanding the difference between standards and personal preferences, even though this is something I have mentioned multiple times as well.
As for who has seriously argued it, here is the relevant quote regarding the Noosphere that got all of this started:
Not to mention it's from a Hours Heresy Novel which are stated to be possibly not accurate reflections of the truth.
To say that Games Workshop's opinion on the Noosphere should be relevant to whether or not a GM personally wants to use it is to say that GMs should cede their creative authority to Games Workshop regardless of whether or not they or their players actually like what Games Workshop is doing, and that is madness. People arguing for this sort of thing don't realize their insanity, because they have signed up for a version of reality in which fictional universes contain facts without examining that assumption closely enough to realize it is insane.