What was the real reason for Chen Sheng's Uprising and Wu Guang's uprising

Sima Qian said this in the "Chen Shi ShiJia":

In July of the first year of the second dynasty, Fa Lu zuo shu Yuyang, 900 people Tun Daze Township. Chen Sheng and Wu Guang were both subordinates and were tun chiefs. It will rain heavily, the road will not pass, and the degree has been lost. Lost time, the law is cut. Chen Sheng and Wu Guangnai conspired: "If you die now, you will die, and if you want to die, you will die? Chen Shengyue: "The world has been suffering for a long time." I heard that the second son of the second son was also not established, and the founder was the prince Fusu. Fu Su gave a number of advices and envoyed foreign generals. Now or not guilty, the second killed. The people heard of his sages, but did not know his death. Xiang Yan was a Chu general, a number of meritorious people, a soldier who loved soldiers, and the chu people pitied him. Or think dead, or think dead.

From the above text, it can be seen that there are three reasons: one is that the heavy rain is lost and the time is to be killed, the second is that Hu II is not standing, and the third is to kill Su Xiangyan.

We say that the main reason for these three reasons is that it is raining heavily and missing the deadline to be killed. This article is closely related to Chen Sheng and Wu Guang, and can be said to be the main reason for the uprising.

The question arises, why is it out of date when it rains heavily? Wouldn't it be raining and marching? At least the march in the rain will not die, and it is possible that it will not be lost. However, Chen Sheng, Wu Guang, did not try, and directly said that "losing time is also death", it seems that there must be other reasons behind this.

Sima Qian said at the beginning that Chen Sheng and Wu Guang had long had the intention of plotting rebellion, but only the heart of rebellion was not enough, there must be a reason for rebellion, and the above said that "failure of time is also death" is not the reason for rebellion, then the remaining reason is Tun Daze Township, which coincides with heavy rains, and also rushes to Yuyang. This is an unfinished task, why?

Daze Township is definitely a low-lying place; Yuyang, it must be a high place. When it rains heavily, it is difficult for a person to climb from a low place to a high place. As the saying goes: people go to the high place, and the water flows to the low place. But when the "heavy rain" prevents it from yearning for the "high place", it will swear to the "heavy rain" to gamble, and will simply make out of line.

Osawa Township itself is a place with a lot of water (harmonic tax), which is not to mention the natural disaster caused by heavy rain, but also increased the water (tax), and the water added to the water directly makes people unable to live.

From this point of view, the real reason for Chen Sheng's Wuguang uprising was that the natural disasters of taxation and servitude caused the people to live in poverty.