It is not possible to give a long rope, in an indefinite sense, to the desires of people. There should be a restriction, not in the manner of a pressure or subjugation by force, but a rational acceptance of the presence of similar needs in all people, everywhere. If I am hungry and I want food, a fact that has to be accepted, it is also to be accepted that another will also be equally hungry and he needs food. It does not mean that I am the only person who requires food. But the selfishness of a person can go to an inordinate extent and can violate the rationality of the presence of similar needs in others.
Selfishness is a devil.
If there is a Satan, here is he, violating law and asserting isolation. Such an impetuousness of the will conflicts with everybody else, because it wants everything for itself. And if each one is to project a similar attitude, there will be a complete chaos and an imminent destruction of human existence itself. Each one will fly at the throat of the other and no life will be there in a few days. This is not a happy state of affairs, and human beings who are selfish are also intelligent.