This may sound pretentious, but I wouldn't really trust someone who is average for overall cognitive ability to be able to critically evaluate and weigh evidence relating to complex issues while maintaining reasonable accuracy. And there are of course many, many people who are below the mean in terms of cognitive ability. The data from the National Adult Literacy Survey is a good example, and functional literacy is arguably a proxy for g. Simple tasks requiring relatively little pre-existing knowledge were used, yet most people flunked.
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