The tragedy of Karbala

In 680 C.E., the Muslim world shook to its foundations by the tragedy of Karbala. The tragedy of Karbala would bot have taken place if Uthman had not been assassinated. If Uthman had not been assassinated and he had died a natural death, he was likely to be succeeded by Ali. In that case there would have been no Ali-Muawiyah conflict for the conflict merely arose because of the demand for the vengeance of the blood of Uthman. In the absence of such a conflict, Ali would not have been assassinated and the Umayyads would not have come into power. As such there would have been no occasion for the tragedy of Karbala.