God, lonelily, realizes credulously the fittest among...
God, lonelily, realizes credulously the fittest among Mohammed's followers for leading the nation and applying the doctrine, the most favorable, the keenest and the most acquainted of that divine doctrine. For these reasons, it was God's dedicate concern to provide the political and religious leader after Mohammed. In case people accepted and swore allegiance to that individual provided by God as the political and religious leader, they should be guided to the right path.
Otherwise, a process of disintegration between political and religious leadership would occur, and the political leader would be an individual other than the religious one. Thus, that ruler — political leader — shall certainly predominate the religious leadership someday. AlHusseinbnAlibnAbiTalib (peace be upon him) is, according to doctrinal texts, the Imam, the political and religious leader and the guide of people during his lifetime.
Nevertheless, people, coercively or voluntarily, swore their allegiance to YazeedbnMuawiya who, consequently, became the political ruler while AlHussein was the religious authority. The instance should have been that AlHussein holds political and religious leadership together. As people declared fealty to Yazeed, an isolation between the political and the religious leadership occurred. Yazeed became the actual ruler.
Since religious leadership was appendant to the political, the ruler would not be content before he denuded the religious authority from his competencies, so that he would be able to have the religious leadership beside the political. This exactly what happened. Killing was the only way Yazeed had to deprive AlHussein of his competencies. He did kill him. Shias say that improvement of the Muslims' conditions and future is depending upon combining the political and religious leaderships.
In other words, the ruler should be the religious authority and that ruler and religious authority should be the one elected by God. As an abstract we say: God has been dedicatedly the specialist in electing and nominating the political and religious leader of the nation. This is by the reason that He, the Elevated, does credulously realize the fittest for leading the followers and applying the doctrine, the most favorable, the keenest and the most acquainted of that divine doctrine.
Before the Prophet's being taken to the Exalted Associate, God had elected the political and religious leader for Muslims.