According to evolutionary psychologists, our capacity for reason didn't develop to be a dispassionate tool for finding truth. Instead, it evolved as a social mechanism to justify our positions and persuade others. This explains why factual evidence often fails to change minds and can even reinforce existing beliefs.

Simply stating that conventional wisdom is wrong is a weak "gotcha" tactic. A more robust approach involves investigating the ecosystem that created the belief, specifically the experts who established it, and identifying their incentives or biases, which often reveals why flawed wisdom persists.

We don't form beliefs based on neutral evidence. Instead, our existing identity acts as a filter that shapes how we interpret neutral events, creating new 'evidence' that reinforces our pre-existing beliefs, whether positive or negative.

A flawed NTSB bus safety study contained too many errors to be a clean conspiracy, yet all errors biased the result in one direction, ruling out random incompetence. The true cause is often a systemic or tribal momentum towards a desired conclusion, a phenomenon more complex than simple fraud or ineptitude.

The historian's primary value is not merely recounting events but actively questioning and disrupting established narratives. This intellectual function is vital for protecting the public from misinformation and keeping society grounded in reality, preventing it from listening to lies.

The entire British Gallipoli strategy was predicated on the racist assumption that Ottoman "Turk" soldiers were inferior and would quickly flee. This belief caused planners to ignore the enemy's battle-hardened status, defensive preparations, and strong motivation, with fatal consequences.

Thucydides' detailed account of the Peloponnesian War undermines the simplistic "trap" model. The war resulted from a host of complex factors involving multiple states and specific grievances, not just the dynamic between a rising Athens and an established Sparta.

The human brain is not optimized for changing its mind based on new data, but for winning arguments. This evolutionary trait traps people in their existing frames of reference, preventing them from assessing reality objectively and finding effective solutions.

To counteract the brain's tendency to preserve existing conclusions, Charles Darwin deliberately considered evidence that contradicted his hypotheses. He was most rigorous when he felt most confident in an idea—a powerful, counterintuitive method for maintaining objectivity and avoiding confirmation bias.