The concept is caste system was never to demean anyone, it was merely there to preserve the moral ground of structure.
It is used in the time of need, where a whole nation could form as one.
Although everyone had their duties to complete. Orginaly, pakistan was all punjab and it was conisdered the homeland of all sikhs and afganishtan was the homeland of all muslims. Due to the term-oil of Parliamantary disputes, the people were severed from their lands and the whole nation was left in difigurement.