Yes, unfortunately, I guess it's human nature. Since the stone age, and even before who knows, nature designed us to live inside our own groups, to protect and feed each other, but to fight and to compete with other human groups. Greed is what moves humans as a survivor instinct: something useful some 10,000/5,000/500 years ago, and kept to this day in our most inner self, even though it is not at all useful any longer, as we have enough technology to provide the necessary for worldwide benefits (we just need to learn how to share).... maybe in another 500/5,000/10,000 years, if we're still here, greed will be left behind and share will prevail