eli5 why do we (as a species) develop irrational fears?
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Irrational fears don’t develop species wide. There are some very rational fears that can seem irrational at times, like fear of spiders if you live in an area without a lot of venomous spiders. But the fear developed in an area where spider bites could kill you. So it makes perfect sense to have a healthy fear of tiny spiders.
Fear of the dark is very rational. For thousands of years, if you were caught outside of a shelter at night the chances of you dying were extremely high.
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