system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If a fever is part of the way your body naturally combats viruses/bacteria, then why is it recommended to take medicine to lower your body temperature?
gpt
Because the immune system sometimes goes overboard and can hurt you.  

We often think of the immune system as an army taking orders from the body, but it's better to think of your immune system as a bunch of colonists, living on the land, which is you. 

Usually, the colonists are actually helpful.  They keep the pest population in check, and their regularly rotated fields are way easier for you to support than the random tangle of trees and shrubs that used to grow in much of the island. 

But, one day, you notice there's a problem.  A new kind of pest has shown up that the colonists are having trouble dealing with, some kind of weird fly that is causing trouble.  To stop it, they have started setting fires all over to kill the fly breeding grounds.  

The colonists don't realize this, but the fires are actually burning too wide and too hot.  With the heat and charring of the soil, the colonists are killing off all the things that make you, the land, sustainable.  If you don't take some steps to rein them in, they may well kill the flies, but they will kill you with them.