Reason is adaptive for a number of reasons. It's certainly plausible that interpersonal interactions were a primary factor. Look at Gorillas. They are intelligent, but are in fact primate "cows." They sit around and eat. They have zero need of intelligence. The evolved intelligence because they live in social groups with complex interpersonal politics, and the ability to "plot" was clearly adaptive.
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"Government, even in its best state, is but a necessary evil; in its worst state, an intolerable one." — Thomas Paine
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