In short, the use of the chopsticks for eating can be traced to the China population boom and the teaching of Confucius against making the knife part of their eating utensils.
1. Origin of the Chopsticks
The first chopsticks were created in China between 4,000-5,000 years ago, but were mainly used for cooking purpose because they were suitable for reaching the bottom of pots filled with hot oil or water. There were mostly carved from twigs. Population boom across China was one of the major reasons chopsticks came into use. Cooking utensils became very scarce following the population boom. So people started cutting foods into very small parts to accelerate the rate of cooking. The very tiny morsels eliminated the need for knives, as there was little or nothing to cut. Nevertheless, eating with chopsticks became a way of life. Making the chopsticks were neither expensive nor difficult. This was the birth of the era of eating with chopsticks.
2. Teaching of Confucius
The teachings of Confucius also contributed to the decline in the use of table knives in this part of the world at that time. He was of the beliefs that eating with knives was never proper. In the words of Confucius, "The upright and honorable man stays away from both the kitchen and the slaughterhouse. Such a man never allows any knives on his dining table."
This is the reason why all traditional Chinese chopsticks are always made to be blunt at the tip and a very poor alternative to knives and forks.