because there just is to help your nose not to get bacteria\cooties\germs
Do not be afraid of plucking your nose hair. Nose hair is a simple edible part that grows under your nose . I suggest you make a idiot of yourself in front of your fiancee ( if you have one).
The hair in your nose protects you by catching things like dust, germs, etc.
the nose hair cleans the air you breath in there
Main function is to keep things from entering the lungs from the nasal cavities. They actually block a lot of particles, dust, allergens etc.