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defense_attorney_fallacy
The Defense Attorney's Fallacy is the mirror image of the Prosecutor's Fallacy. It occurs when someone argues that because each individual piece of evidence can be innocently explained, the total body of evidence is weak. This ignores the fact that while each piece alone may be unconvincing, their conjunction can be overwhelmingly persuasive. The probability of ALL innocent explanations being true simultaneously may be vanishingly small, even if each one alone is plausible.
A defendant's DNA was found at the crime scene ('many people were there'), he owned the same brand of gloves ('common item'), his phone pinged near the location ('he lives nearby'), and a witness identified him ('witnesses are unreliable'). Each piece is explained away individually. But the probability of an innocent person matching all four simultaneously is vanishingly small.
A tobacco company's legal strategy: each study linking smoking to cancer has methodological limitations. Each statistical association could have confounders. Each animal study doesn't prove human effect. Each epidemiological result could be publication bias. Individually, each critique is fair. Cumulatively, dismissing all evidence simultaneously requires the joint implausibility of every alternative explanation being true.
A medical team evaluating a patient with fatigue, joint pain, a rash, and elevated inflammatory markers is told by a consulting doctor: 'Fatigue can be stress, joint pain can be normal ageing, rashes are common, and those markers fluctuate.' Each symptom has an innocent explanation. The pattern — lupus — emerges only when the evidence is evaluated jointly.
Binary (yes/no) questions an LLM must answer to identify this aspect: