What does Ariel Sharon's life teach us?

Reading about Ariel Sharon's life, I felt sorry about the futility of his exertions during the major portion of his life. Imagne working for something, believing in the motive ardently, and then realising that the fruit of the work would be detrimental to all he stood for. Sharon came to realise that if Israel held on to the occupied territories, a time would come when the Arabs would be a majority in "Greater Israel". If the Arabs voted en - masse in the future, then one among them could come to power and the very existence of Israel would be undermined.
How futile it is to believe in a vision so completely, when one knows that it is impossible to control all the factors and the invironment around us. Could Sharon have fathomed that he would suffer a most debilitating stroke, when the Jews of Israel needed him most? He, like the rest of us found it hard to believe in his own mortality, he must have found it difficult to imagine that he, too, will die one day.
If one believes in god, being of any faith, one comes to the conclusion that human imperfections can put a spoke in any wheel. Would Jesus Christ have been crucified, if not for human imperfections? The Christians believe that Jesus suffered terribly on the cross, otherwise of what significance would his crucifixion be? Similary, why were the Jewish temples destroyed more than once? Why did the holocaust take place? Because of human frailties. If after Prophet Mohammed's visions there is still evil in this world, If after Christ's crucifixion there is still evil, can there ever be a perfect world? Can a mere man, not being a Prophet of God, or an Avatar, or a Divine Being, change the world according to his likes and dislikes?