> I have seen talk pages where the same three editors who seem to be part of the same echo chamber discussing issues preventing any alternative opinion or tone to come in the article.
I believe I am part of such a cabal, despite my contributions on Wikipedia totaling about half a dozen in the past decade. Why would I be part of such a cabal? Well, first, I have no contact whatsoever with the other editor other than edits made with the same purpose — and that purpose is to deflect an attempt by other editors to erase the details of a (well-sourced) historical event from Wikipedia and replace it with alternative facts more amenable to certain political ideologies. I (and my fellow cabalist) have explained in detail on the talk page that the other editors were pushing a fringe position which was not backed by any reliable sources, and with this justification I have removed every edit made by those editors attempting to change the facts in the article, even to the point of removing tags they add to the article indicating that there is a dispute as to its accuracy! And yet I believe I am in the right, due to overwhelming evidence of the correctness of the article's contents, and incorrectness of the position being pushed by (what I see as) rogue editors.
The thing is, probably every single such cabal is maintained with essentially identical motivations, at least in the eyes of the cabalists. If even some fraction of us are correct, it shows that you have to choose between cabals and an encyclopedia of misinformation and propaganda. Except, of course, haha, there's no choice at all, because some portion of the cabals are pushing misinformation and propaganda. In my view the Wikipedia experiment has failed, and not merely in some contingent way but in a way that shows that the concept cannot be executed as imagined, an "encyclopedia anyone can edit". Some [substantial?] portion of the information contained will be misinformation, for the same reasons that misinformation exists at all.
Unfortunately, insofar as Wikipedia seems to have displaced many other sources of information (which, to be fair, needn't have been any more reliable — a traditional encyclopedia no doubt contained misinformation spread by the editors, with the only saving grace being a relative dearth of information limiting impact), I fear that it will prove to have been the greatest setback to the aggregation of accurate human knowledge so far in the history of humanity.