That just means they are enforcing their biases on the information. Winning doesn't mean they got it correct, just that they achieved control of the narrative.
That's going to push the means of winning to editing towards the collective biases of the majority of wikipedia editors. Just consider the fact that at various times in our history that commonly accepted knowledge was that the Earth was flat, the Sun, Moon and Stars revolved around it and that slaves were property instead of people.
Effectively this is a proof that mob-sourced information tends towards the mob's interpretation of information and is not necessarily the truth.
I think a lot of people reading Wikipedia forget this and makes me disagree with your last statement -- there's a high potential for danger to the reader if the prevailing mob opinion is outwardly destructive or self-destructive.
