If this is quite widespread, it should be fairly straightforward to point to an example of a page that's being defaced with misinformation, which would include an edit history and perhaps a Talk page documenting whatever sides to the debate there is that's preventing consensus.

I don't disagree that weird bullshit occasionally happens on Wikipedia, but I have noticed that as soon as light is cast on it, it usually evaporates and a return to factual normality is established.