eli5: why do humans have allergies (hay fever, pollen, etc)
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Imagine a fire alarm system but for when it smells like Bread in the building, or when it smells like bacon, or carbon monoxide.
Alergies are your body reacting to what it sees as a poison danger. The good this is that it shows that it works agressively, the problem is it reacts agressively to the wrong substances.
So the reason it has not been taken out is that it is not a condition that can keep someone from living and have kids (if they are lucky and careful with their exposure once they know.)
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