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Bernie Madoff successfully defrauded the most experienced financial experts of billions of dollars with his Ponzi scheme. Mao Zedong's progressive "Great Leap Forward" bird extermination campaign caused millions of Chinese to starve to death. These are vivid examples of complete bullshit that any of us can fall victim to.
In today's world of fake news, conspiracy theories and populist politicians, bullshit can disguise itself well. Presented as truth by authoritative or famous people, it can look appropriate, worthy of attention, even useful. Trusting it can ultimately lead to severe legal consequences, severed relationships, and, most regrettably, wasted time and resources.