Ever encounter a person who used you in order for himself/herself to escape from being scolded or blamed you for things that you've not done/responsible for? I'm sure we have seen a lot of this throughout our lives. A person gets credits and the other becomes a scapegoat. Even young children nowadays do so too. It is in our very own nature.
Have you also ever felt weary, unhappy, frustrated, demotivated, and betrayed when another person for eg. your friend, your immediate supervisor take credits on something you did.... You are supposed to be the one who should be taking these credits and be praised. Instead, after you have put your effort, time and hard work, someone came along and take those hard work of yours for himself/herself in order to look good in front of people.... so, unbearable right?
You must be thinking is this fair? No it is not, not fair at all. But, hey, the world is a fallen world, no one and nothing is perfect. But, that doesn't mean we have no ethics in our work and dealings with people. One might say this is for the survival of the fittest, but, at the end of the day, when our bones are brittle, our hearts no longer gives us any consistent beats, and our mind no longer function well, we will look back and ask what good is it to strive to gain the world and win praises, for everything will one day turn to ash/dust.