What does Mozi mean by telling the story of Lu people burying their fathers?

Mozi told the story of Lu people burying their fathers. What does he want to explain? In order to achieve his goal, he can tell some white lies, and people sometimes need a goal to work harder.

Original text:

Mozi advised his disciples to learn, saying, "You learn quickly, and your original work is" I ". Be an official. " Disciples are responsible for Mozi's official duties in the semester year. Mozi said, "Have you heard the original" I "written by Lu people? There are five brothers in Kundi. His father died and his eldest son was addicted to alcohol and refused to be buried. His fourth brother said that if my brother was buried, I would sell wine for him. After the burial, the fourth brother asked for wine. The fourth brother said: only my father buried his father? I'm afraid people will laugh at me and bully me with wine! If you don't learn today, you will laugh at yourself, so advise your son. " Therefore, I no longer seek office.

Translation:

Mozi advised his disciples to study, saying, "You should study quickly. If you reach my level, you are an official. " Disciples studied for several years, so they asked Mozi to be an official. Mozi said, "Have you heard the story of the Lu people? There are five brothers whose father died. Big brother likes drinking and doesn't want to attend the funeral. His four brothers said,' Brother, if you attend the funeral, we will buy you a drink.' After the funeral, the boss asked four younger brothers for wine. The younger brothers said,' It is only natural that our son should bury his father. Are we the only ones with fathers? We are afraid that you will be laughed at by others and cheat you with this! If you don't study, people will laugh at you. That's why I advise you. "Mozi's apprentice no longer requires an official.