The fallacy of “one single proof” occurs when someone rejects overwhelming evidence because of the lack of specific evidence and declare the entire argument invalid.
A common trick of flat-Earthers is to demand unrealistic evidence of spherical Earth. After their demand is not met, they would proclaim Earth is not a sphere, and conveniently ignore all the other evidence of spherical Earth.
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Flat-Earthers often commit the fallacy of moving the goalposts. When their claim has been proven wrong, they would revise their claim and demand another evidence that is harder to fulfil. They would do this repeatedly until they present an unfalsifiable claim, a claim that is impossible to prove.
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