Groups do not cancel bias. Wikipedia is overwhelmingly western, which becomes a western bias. Groups reinforce bias.

groups usually cancel bias

Lmao, so we're just saying shit now, alright. Famously unbiased:

• The police
• Lynch mobs
• Academic institutions
• Think tanks
• The KKK
• The Clergy
• A group of children

I think you struggle to understand what the word "bias" means. It seems like it just short-circuits in your brain to "bad". A group typically enforce the bias inherent to it.

It requires actively being aware of ones' bias to counteract it, which is one of many reasons why Wikipedias presentation as a "neutral" source of knowledge is an issue. Because it makes doofuses like you trust it like gospel and react like fanatics to the heresy that maybe the website founded by a zionist, with a longtime issue with power-users (not to mention the infiltration of Nazis that gets brought up once in a while in a feelgood story about someone taking them on), a rule against being critical of "approved sources investegation making use of primary sources, an arbitrary approach as to how trustworthy a source is (the main judgement of which seems to be "do they reinforce state dept. talking points?"); well, it might have some issues.