Largely evolution. For the vast majority of human history (and to a lesser extent today), there’s more value in learning a lifelong lesson from a near disaster than from a near bounty of riches. Associating a growl from the bushes with near death and being hypersensitive to that, or nearly dying from eating spoiled food and being overly cautious does way more for evolution’s “purpose” (that being, whatever it takes to keep you alive long enough to reproduce and have your offspring reproduce) than say, eating a super tasty and calorie-dense fruit once and obsessing over it for the rest of your life.
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