Why do ordinary workers resign frequently?

Many units, institutions and companies are short of front desk and window personnel. They recruit people according to the formal process, publish job advertisements and conduct written interview training. Is this a very formal process? It is normal for someone to resign during the training. The most annoying thing about human resources is that they can communicate face to face with a good attitude after just working for two days in three or two months. If they don't have a good attitude, they don't even meet, not even call or text. The spirit of contract is liquidated damages. Don't say that. Do whatever you want. A few days ago, the hot pot spilled hot soup, which is actually a typical example. The client (18 years old) felt that the victim insulted himself and directly took reckless actions. The most terrible thing is that he is willing to bear the consequences. At the big customer window of an institution's business department, a big customer came to handle business at the weekend. The big customers who handle business are small leaders. I guess he is used to bossing people around at ordinary times. He is not very good at accepting people's attitude towards a little girl, and there are rude words between his words. The recipient felt uncomfortable and quarreled. On the same day, they happened to catch a vice president having a meeting upstairs. When they met, they asked the person who accepted it to apologize to the big customer. The person who accepted the inspection refused to accept it and continued to scold the customer. The leader's face hung up.