There is a set of rules for everything , be it your school or
even society . Discipline is important because it is about
conforming everywhere . Say if you're a school principal , would
you allow your students to have it their way ? The students will
have no regards for their superiors when they go to work out there
in the future if no one instils discipline in them 
ok, but they will take feedbacks rite ?
so i will write feedbacks tis year regrading the facial hair
rule to be abolish 