What does the phrase "this must be true because no one has disproven it" exemplify?

The phrase "this must be true because no one has disproven it" exemplifies the Appeal to Ignorance fallacy. This fallacy occurs when a proposition is claimed to be true simply because it has not yet been proven false, or vice versa. In this case, the argument relies on the lack of evidence against the claim as a means to assert its truth, rather than providing substantive evidence for the claim itself. This reasoning is flawed because the absence of evidence does not inherently validate the truth of a statement; it merely indicates that the statement has not been challenged or disproven. As such, the reliance on ignorance—whether it be one’s own or the broader public’s—as a basis for accepting a claim is what characterizes this fallacy.