Why didn't Wang Dao support his cousin Wang Dun to arise and let Wang enjoy the whole world?

In the early Eastern Jin Dynasty, the Wang family was the head of the family, and Xie Jia, the "old Xie Wang", was also at a disadvantage in the sharpness dispute. In fact, Wang Dao can be said to be the closest person to the emperor. His cousin Wang Dun is a general who has mastered the relieving, but there is no surname change in the world.

In fact, it is a situation in which aristocratic families contain each other. The Wangs are a group of people who went south with the emperor, while the local aristocratic families in the south have more prestige among the people. At this time, there is a rising force-Huan Wen. Make the wangs dare not make a move. In fact, the local foundation of the Wangs was very unstable, and at that time, the emperor had intentionally begun to reuse people who were not the Wangs, which made the situation of the court more chaotic.

But Wang Dunxian, who has the relieving power, didn't also the way. Wang Dao was also neutral at the beginning and didn't say anything. However, subsequent developments, such as the accession of Crown Prince Si Mashao, who was smarter than his father, made the Jun Qing side of Wang Dun even more unpredictable.

In addition, although the Wangs are strong, it is certainly impossible to be very United and harmonious within the family. Wang Dun uprising, whether successful or not, will not be his business in Wang Dao, so Wang Dao weighed the interests and helped the emperor kill Wang Dun. It also won great praise for him, for example, he is really loyal to the monarch, putting righteousness above family loyalty and so on.

This is a multi-purpose, so why not?