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I think this is true as a thought experiment, but it suggests that people who lie always do so both self-consciously and because of their self-interest. The post states: But what if we believe something that happens to be factually untrue? Are we still lying? If so, should we be castigated for our lies? It's a tragedy of the commons thing: if everyone tells the truth, we can all trust each other and get on with doing interesting stuff. But if someone lies, they can abuse said trust to acheive their own ends that not everyone may agree on.
A less-conservative definition [of telling the truth] might be, “saying things that are consistent with what we believe.”