why do humans have the overbearing nature of the excess in what he had ..?

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Human beings were created as a SOCIAL,in groups and can not live alone,interdependence with each other, but humans also have basic properties, namely,greed, anger and "grieve". While Wise was an incarnation or the process of social nature and human nature with the mind (brain-power of thought). why people in this world because of its advantages are many arrogant and unwilling to sustain or even leave it ..?