As the one who reaches Nibbana needs only defilement abandon. After having abandoned defilements, one can reach Nibbana. The world today is chaotic, unable to escape long-lived evils. Jealousy, betrayal, exploitation, cheating, quarrels, and war are generally unwholesome. Religions leaders have tried to establish principles and practices which will allow peace to prevail in the world.
People are to do good and refrain from evil.
The central teaching of Buddhism is the purification of the mind. This is not taught by any other religion. According to Buddhism, the human mind is impure by nature as it is defiled by greed, anger, and delusion. It is these three defilements which cause human being to commit all evil deeds. We have seen many times that people who otherwise seem incapable of anger can at times be so angrey that they can kill another person, because they cannot control themselves.