Why does Suzuki think people should “act as one single world”?

If one writes logically, he will prove his point. is this sentence correct or contains an unwarranted shift in person?

How can you paraphrase this, this is about golden age fallacies.these are all rational people who know that older is not necessarily better, but many are taken in by this fallacy and seem no longer able to reason with any degree of reliability

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