Well, you claim to denigrate both extremes, but that is not evident. You also seem to be single minded that "conspiracy theorists" are ridiculous due to some certitude that if based on evidence is not noticeable outside of your mind. There is solid proof that the US government as well as other governments and corporations have habitually used propaganda to sway public opinion all the way up to covering illegal misdeeds. Again I point to findings of the US government itself in the Church Committee and the Rockefeller Commission, MKUTLRA being one of the best known examples. Everyone who brought it up was just crazy wacky conspiracy theorist, as a matter of fact people are still accused of being crazy for believing in it 35 years after Congress brought the information out. Somehow though you seem to be trying to force a distinction in, "official propaganda" and "spontaneous informal fanfiction type propaganda blogs" (whatever that is). The only difference that is apparent is that the government has been shown to be lying consistently for decades and the veracity of the "spontaneous" blogs is as yet unproven. So I don't see the logic in your argument, there may be some logic in it, but it is not readily apparent to me. It seems to me that you are simply jumping on the bandwagon of vilifying anyone who questions authority. A case in point is the Osama assassination, anyone who did not accept the official narrative, even though the narrative kept changing was branded a conspiracy theorist, instead of the more apt label of being skeptical of the governments version of events.
Lastly many of the crazy wacky conspiracy theories may in fact originate from the government, it was a tactic used in COINTELPRO and Cass Sunstein who is the Administrator of the White House Office of Information and Regulatory Affairs co-authored a paper detailing a plan to infiltrate conspiracy sites and groups. It is likely that some of the wackiest theories are proposed by independent individuals, but on the face of it we have proof of past behavior and proof of intent on the part of an agency with billions of dollars at their disposal and little oversight. As well the Army recently requested tenders on astroturfing software to allow a single operative to fake many personas. This demonstrates means, motive and opportunity so the idea that some of the line noise is intentional is not far out at all.
Lastly you mention places like fox news, "manipulating and fostering these cottage propaganda hobbyists" which maybe true, but ignores the Operation Mockingbird premise and the Army recently admitting to placing their propaganda specialist in major news stations for, "work experience". Again with the consistent track record of the US government one would be foolish not to suspect ulterior motives in these types of actions.
So feel free to denigrate those who have a different viewpoint and use magic words to dismiss them outright, freedom of speech and all that.We're going to have to agree to disagree though as I love truth and don't care if the source is "official" or not. I listen to all types of opinions from many different sources and attempt to come to my own conclusions or at least assign rough probabilities so that I may make the judgments necessary to navigate my way through life.