Half of all apparent failures of basic logical reasoning can be attributed to the fact that in everyday language, unlike formal logic, or generally means xor.
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Half of the rest can be explained by sufficiency being mistaken for (or overstated as) necessity+sufficiency
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Humans in general seem to have a strong preferred-exclusivity bias. Things having a unique right answer that is also the one you like. Differently sufficient things are a threat to necessity illusions.
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