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Yes, it is realistic. Other motivations may be out there, like mating and having children, acquiring wealth and/or fame, acquiring power -- but some of these are 'artificial' in the sense that earl...
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#2: Initial revision
Yes, it is realistic. Other motivations may be out there, like mating and having children, acquiring wealth and/or fame, acquiring power -- but some of these are 'artificial' in the sense that early hunter-gatherers with our same mental capacity did not really have wealth or fame to acquire, they barely knew any strangers, and their lives were indeed focused on survival: Food, safety, and family. That is indeed where the human psyche should go (or revert to) in times of any apocalypse. Even sex, romance or having more children will take a back seat to avoiding death, starvation, enslavement by other humans, etc. Life first. Fun second. I don't see a problem with that.