Taken from Sources of Indian Tradition - Vol 1 (ed: Ainslie T Emree)
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Shaikh Hamadani, who is considered largely responsible for the conversion of Kashmir to Islam, wrote Zakhirat ul-Muluk (The Treasuries of Kings) in the second half of the fourteenth century. It contains a clear statement on the origin and necessity of rulers.

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Know ye that among the great ones of the learned, those possessed of intelligence and wisdom, it is established and proved that, at the very moment of creation, by reason of the different qualities and admixture of ability that are bestowed by the bounty of God like a lustrous and bejeweled costume, the souls and natures of men have fallen out differently. Hence, the inclinations, motives, and purposes of men have become different and the difference is manifested in all their words, deeds, and fundamental articles of faith.

The qualities of beastliness and of base morals - tyranny and injustice, hatred and rancor and avarice are implanted in the dispositions of men. Then, in the perfect of His great wisdom, God has decreed that there be a just and competent ruler of mankind so that, by the power of judicial process, the affairs of the progeny of Adam and the rules for managing the affairs of mankind may be kept and preserved on the right path; also a ruler has been ordained by God so that he may endeavor, as far as possible, to put into operation the mandates of the Sharia and to be on guard to preserve the prescriptions of rules of Islam among the people of all classes and, with the prohibitions of punishment and the curb of command, to prevent tyranny over and oppression of the weak by the strong. Thus the physical world may be assured of stability, the bound of the Sharia not invaded by the disorder of oppression and innovation, and the characteristics of brute beasts and camels may not be manifested among people of classes.