We are often more certain than the evidence really allows.
More quotesAgreement compounds like interest. Unfortunately, so can stupidity. Like-minded people do more than miss opposing facts. They lend one another moral and intellectual confidence. Each contribution makes the shared position feel independently verified, despite everyone drawing from the same shallow well. Moderation begins to look timid. The person half a step further becomes the new standard for commitment.
An investment group adores the same company and talks itself into a larger bet. Product enthusiasts reassure one another that customers will understand the unfamiliar feature. Leaders shaped by the same glorious growth period interpret every warning through experience that points in one direction. Conversation increases conviction while adding almost no new information.
Manufactured argument is a flimsy cure. The permanent cynic becomes predictable scenery, performing opposition after everyone knows which answer wins. Independence has to occur before social cues announce the virtuous position.
Private forecasts help. Pre-agreed criteria help. Evidence gathered from people who will experience the consequence helps. So does asking everyone to write what would change their mind before discovering which view carries status.
If nobody knows, the consensus may be thirty copies of one opinion with different signatures.
Background diversity cannot rescue a process that immediately teaches diverse people the approved answer. Ask for each private estimate before discussion and keep it. Afterwards, compare what changed, when it changed and which evidence supposedly caused the movement. The gap may reveal persuasion—or merely show that the discussion signalled which answer was safe.