In political science, the conventional view is that polarization observed in the US is not a product of the two camps drifting further apart (in the sense of having more extreme views), it's the product of issue divisions aligning more closely to partisan camps. Consider Kim Davis. Kim Davis was a county clerk who went to jail after illegally refusing to issue a same-sex marriage certificate after the court system ru…
the wisdom of the crowds covers this ground too--too much correlated thinking via information cascades often leads to bad decisions and outcomes. you want more independence, even if that increases the number of "wrong" opinions. having more wrong opinions is infinitely better than poor information cascades, as long as they're relatively independent and queried in a statistically sound manner for decision-making.