One ideal of rationality, to which people used to appeal, is to refuse to accept anything on trust or authority, to evaluate any claim strictly on the supplied data and arguments. Only thusly can one practice the intellectual responsibility of science. Unfortunately, this is such an impractical ideal that even practicing scientists don’t live up to it. No one has the time, resources, and intelligence to verify all his beliefs; he must fall back on trust. More recently, a new ideal has emerged: the rational man practices perfect credulity and docility to credentialed experts. I have found two types of justifications for this.
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