It was said that Buddha fulfilled the perfections and preferred to suffer himself for hundred thousand eons in the cycles of birth and death because he wanted to attain the Buddhahood and explain the Dharma to liberate all people from the suffering and show them ways to ultimate happiness. When he was a Bodhisattva, he saw the deep and endless suffering of the people, and saw the purity of Dharma, and encouraged compassion and wisdom, he vowed to save the people. When he left the throne, he purposes were again to liberate the people from suffering and bring them to ultimate happiness.
The ways to attain the ultimate happiness are by following and realizing the Four Noble Truth, the Co-arising, and the Real Characteristic of the Nature. To achieve the goals, he needed the many experts and the strong leadership to explain to the people, to educate them, to change the troubling social systems, the wrong understanding, to free their mind from unreasonable traditional and religious beliefs. They must have the good, valuable and dignified lives which is meant that they must have the good heart, compassion, disciplinary, calmness and wisdom. Once again, Buddha realized that in order to achieve these goals, he need the very skillful people, the strong structure and leadership, scarification for the good of the many, and skillful means of leaders and followers.