Sometimes, we have to say that selfishness is one part of our nature, just like jealousness everybody had. Even though a little boy can understand to prevent his favourite toys from sharing with other little boys. Totally, this is unconsciousness action the little boy did and this is a reflection of natural personality without any masked affection. They can easy switch their joys and sorrows on face and don't care others' feeling of happy or unhappy, such funning things can never happen in the real adult world especially in fierce competition of society. It seems like everyone in the real society wears one or more masks to better fit the current situation, I know this is the result of evolution and as one of basic skills how to polish oneself is becoming more and more important nowadays. It's hard to say everything can follow-up oneself mind, after all, we live in real society and we need to comply with lots of regulations no matter you are willing or not willing.

    Sometimes, we can do to something is to balance own selfishness, don't go overboard about something in order to keep basic code of professional ethics in company or in society, don't let it far away from original tracking.