Even if he is tyrant and sunk in sins (like in the case of Yazid...

Even if he is tyrant and sunk in sins (like in the case of Yazid, or Today's King Fahd), the majority of the scholars from the shools of Hanbali, Shafi'i, and Maliki discourage people to rise against that Caliph. They think that they should be presevered. Shiats say that Imam must possess above all such qualities as knowledge, bravery, justice, wisdom, piety, love of God etc. The Sunni scholars say it is not necessary.

A person inferior in these qualities may be elected in preference to a person having all these qualities of superior degree. Shiats say that Ali was appointed by Allah to be the successor of the Prophet, and that the Prophet declared it on several occasions. More than one hundred of those occasions are recorded in the history. The Sunni scholars believe that the…