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Your body can also just decide it doesn't like a finger or limb and kill it.
Yeah, the immune system can be moronic. Intelligent design my ass.
However, there's something extra special about getting poked in one eye and having your own immune system decide that an eye for an eye means your good eye has to die.
I think the immune system can't see the eye, so it's never trained to avoid it. If the eye is damaged, the immune system can become aware of it and start reacting. Once it starts, pulling it back is not easy.
The immune response system is simultaneously amazing and insane.
It basically deliberately scrambles part of the DNA in the immune cells that create antibodies. The rest of the body then sheds cells into the blood to move to the lymph nodes. Any immune cells that react then self destruct.
It's the equivalent of firing a paint blunderbuss at a wall, and creating a silhouette by standing in the way!
My immune system pisses me off constantly.
It let COVID through three times despite me rigorously keeping up to date with the vaccines as much as possible, and at the same time it has destroyed my thyroid gland and it has declared cherries and peaches as terrorist infiltrators.
I feel like if my immune system is so bored it needs to attack harmless things, I should never have to deal with any actually harmful thing.
It's like a cop that beats up an unarmed teenager, but hides when someone is shooting up a school.
I definitely think there are grounds to the cleanliness hypothesis. Basically the immune system expects a certain amount of activity. If it's underperforming, the body systems assume it's a problem with the immune system, not a lack of bugs, because we are too clean. It then racks up activity levels, causing problematic autoimmune or allergy reactions.
that last bit is very satisfying to say
Fuck sake! How else am I supposed to pick my nose?
You still have toes, ostensibly.