Why is it hard for them to change for a better world?

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They will keep making the same mistakes all over and over again and not even realize it. If we really need a war then why killed citizens? If we really need a technology then why we do the pollution? When are we going to learn? But I know all this won't change because we are vain enough to look at our mistakes and say that it's supposed to be that way. Maybe you can express your emotion on why can make the world a better place to live for everyone.