Sometimes, in the course of a debate or discussion, a secondhand statement comes under consideration. The actors in the debate must then evaluate how relevant that statement is to the their discussion. This happens in media during interviews, in class discussions, on the internet, with friends and family, and beyond. Wherever it happens, you are as likely as not to hear a particular phrase—“no reason to lie.”
“Look, he has no reason to lie.”
“Why would he lie?”
“She doesn’t get anything out of lying about this—she has no reason to.”
However it arises, the implication of the argument that someone “has no reason to lie” is that having no reason to lie is, itself, evidence for truth.
And our understanding of logic and evidence is so bad that we often accept that.
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