Everything is peaceful except human being

I was watching schindlers list, a wonderful movie made by speilberg. Not that the movie depicts what has happened in reality, but the fact that the greed of a single person could inject such a bad effect on many is clearly displayed. Why is it that human beings forget from time to time that they are in this world for sharing the beautiful space called earth. Why do they dont respect others faiths, opinions. Just imagine a world where all the people are alike and all following the same beliefs, faiths, religion.... no one would be able to talk to each other, reason being they are in the same path.. if only people cross opposite they can talk and know whats there in the opposite direction. Every kid born in this world is innocent. Always loving, shares his love. Where from this hatred gets injected... all because of greed,selfishness,jealousy, command,power. when we are not going to stay forever, who are we dominating?? on whom are they selfish about?? An astronaut finds the earth peaceful. A lonely place, the mountains, the rivers, the oceans are all peaceful. when the rivers, oceans get anger where do we stand.. they can just wipe out the civilization. Its only when a human being sees another peace doesn't prevail. The simple reason being greed, jealousy taking over the mind. People must realize they are born human beings first, and then are forced or compelled by the surroundings to follow a particular religion, caste or faiths. All are in this world to share the little space available. Let the senses of people prevail. It is then the world will be peaceful filled with happiness..everlasting