People are allowed to change their opinions or assessments in the light of new evidence. Diametric changes of position are fine and one should not be pilloried for making such a shift in outlook. Quite the contrary. But when the passage of time reveals that a person just recites the same litany despite being continually at odds with the evidence, then that person’s view should be disregarded, notwithstanding the old saying that a defunct clock is correct twice in each 24 hours. The US...
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