Q:

Conspiracy Theory Fallacy?

This is Wikipedia's definition of conspiracy theory:

A conspiracy theory is an explanation of an event or situation that
  invokes an unwarranted conspiracy generally one involving an
  illegal or harmful act carried out by government or other powerful
  actors. Conspiracy theories often produce hypotheses that
  contradict the prevailing understanding of history or simple facts.
  The term is a derogatory one.

What kind of fallacy does this qualify as? Or is it not a fallacy at all but some other kind of mind game?
There could actually be two or three fallacies at work here. The key word in the first sentence is unwarranted, while the key word in the second sentence is often. Finally, we're told that "conspiracy theory" is a dirty word (derogatory).
EDITED to put this in better perspective. Here's Merriam-Webster's definition of conspiracy:

a theory that explains an event or set of circumstances as the result
  of a secret plot by usually powerful conspirators

It's simple and to the point. There's no obfuscation or name calling involved. Wikipedia clearly jumps through several hoops in trashing that definition. Yet no one here can identify the fallacies involved?

A:

Wikipedia commits the following logical fallacies in the quoted paragraph:

Cherrypicking. The definition comes from a single source, John Ayto's "Twentieth century words" published by Oxford University Press.
Unverifiable source. Since books.google.com does not have electronic text for this book, I was unable to confirm the entire definition actually comes from the book.
Contradicts better established source by same publisher. https://en.oxforddictionaries.com/definition/us/conspiracy_theory defines conspiracy theory in its entirety as "A belief that some covert but influential organization is responsible for a circumstance or event." There is no mention of the term being derogatory. The online dictionary is maintained by the Oxford University Press, the same organization that publishes "Twentieth century words". However, the site is intended to be an actual dictionary, where as "Twentieth century words" is intended to be a work of entertainment.
Contradicts respected dictionaries. Webster's dictionary defines conspiracy theory as "a theory that explains an event or set of circumstances as the result of a secret plot by usually powerful conspirators" (https://www.merriam-webster.com/dictionary/conspiracy%20theory) with no mention of it being derogatory.
Contradicts other wikimedia sources. Wiktionary gives two definitions of conspiracy theory: https://en.wiktionary.org/wiki/conspiracy_theory -- the primary definition is "A hypothesis alleging that the members of a coordinated group are, and/or were, secretly working together to commit illegal or wrongful actions including attempting to hide the existence of the group and its activities. In notable cases the hypothesis contradicts the mainstream explanation for historical or current events". It is only the second definition that states "Hypothetical speculation that is commonly considered untrue or outlandish". Usage notes also clarifies that the term is not derogatory: "The phrase conspiracy theory is sometimes used in an attempt to imply that hypothetical speculation is not worthy of serious consideration, usually with phrasing indicative of dismissal (e.g., "just a conspiracy theory"). However, any particular instance of use is not necessarily pejorative. Some consider it inappropriate to use the phrase "conspiracy theory" in an attempt to dismissively discredit hypothetical speculation in any form."
Edit history suggests active censorship. While it's hard to tell with Wikipedia, the edit history https://en.wikipedia.org/w/index.php?title=Conspiracy_theory&action=history's comments and content indicate consistent censorship. Examples:

"Mixing up verified conspiracies with conspiracy theory is misleading"
In https://en.wikipedia.org/w/index.php?title=Conspiracy_theory&diff=804439748&oldid=795751074, a user uses the Webster's dictionary definition verbatim, noting "I have changed your EXTREMELY biased definition to the WEBSTER dictionary CORRECT definition. Seeing as you guys just let this be completely biased, which is beyond disgusting". The edit is reverted in less than 30 minutes.
Every edit that validates conspiracy theories with actual proven conspiracies is reverted.

Because anyone can edit wikipedia, this doesn't necessarily mean there's a conspiracy re editing the conspiracy theory page, despite my joke in the comments. However, the page is clearly being edited/reverted by people who want to discredit conspiracy theories.

