um, where'd the phrase originate?Ah, the old "well you can't prove it DIDN'T happen!" argument. Now, while it is true from a philosophical standpoint that it is impossible to PROVE a negative, from a practical standpoint, it is reasonable to consider certain claims proven false for all practical purposes. Claims without any supporting evidence, that kne could reasonably expect there to be supporting evidence for, if true.
For example; you can't PROVE I wasn't an Apollo astronaut who walked on the Moon, but given the complete absence of evidence, and the fact that it would be reasonable to expect evidence if I were, it's safe enough for all practical purposes to consider the claim "Armoured walked on the Moon as an Apollo astronaut" disproven. See also; the dragon in the garage thought experiment.
Speaking of obfuscation *eyeroll*