Lions are big, they have long teeth and make loud noises. Lions are very obviously scary and look dangerous
Spiders are small, and easily crushable. They are not obviously scary or look dangerous, yet they can still very dangerous.
Thus it is advantageous for us to have a deep-seated primal, fear of spiders (and snakes), because otherwise we wouldn’t be scared of these potentially lethal animals
Edit: deep-seeded —> deep-seated
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