Because Governments do, what they do, only for two reasons: 1. Because the governing party gains something politically from such actions. Or, 2. Because people demand it. read more
These people would be fairer than most Indians. Thus over time, first in North-West India, then North India and then South India (during reign of Mughals, Tughlaqs, Turkish Sultans), fair skin got associated with power, strength and thus aristocracy. read more