Liu Beibai's city was isolated, and Zhuge Liang vowed to "follow him to death" to be loyal to the "Son of Han". We do not need to argue that Liu Chan is not faint, but only to look at several Shu Han courtiers who assisted him, we can understand that an emperor as weak as Liu Adou reigned for more than forty years, but no one wanted to seize the throne and usurp power.
After Liu Chan succeeded to the throne, Zhuge Liang went all out to assist the Hou Lord. The Shu Han military and political and financial power in one of the xiang was upgraded to "xiang father"! Zhuge Liang, on the grounds that "a corner of peace cannot be held for a long time", went out of Qishan six times in succession and raised troops to cut down Wei. However, people are not as good as heavenly calculations, shu Han Cheng Xiang finally failed to complete the grand wish of "Zhongxing Han Room", accumulated labor and disease, WuZhangyuan returned to heaven and lacked skills, and returned to the west with one life!
Liu Chan was able to quickly take power, and there was also a very important background that the two people who had the potential to be powerful in the Shu Han Dynasty were eliminated by Zhuge Liang successively, that is, Wei Yan and Liu Feng. Liu Feng was Liu Bei's righteous son, but was once regarded as a successor by Liu Bei, and his position in Shu Han was similar to that of Cao Zhen in Cao Wei. If Liu Feng did not die, and Liu Chan died early, then there may be a situation like Cao Zhen's being entrusted with an auxiliary government, and the imperial power of Shu Han may also be threatened. Wei Yan was the same, if Zhuge Liang really arranged for him to take over the military power when he was dying, then Wei Yan could become Dong Zhuo of Shu Han.
Regardless of whether Liu Chan fainted or not, incompetence was certain, why could such an incompetent prince still sit firmly on the throne?
The founder of the Shu state, Liu Bei, was the world that was sought by benevolence, and it was also the world that was governed by this, and many of Liu Bei's followers also looked at this point to follow Liu Bei, so even after Liu Bei's death, these ministers who assisted the Shu state still did not forget the heart of benevolence, so the roots were very positive, Miao was very red, and naturally they would not easily rebel.
The throne of the Shu state in the late Three Kingdoms period was very embarrassing, the internal and external troubles were light, and it belonged to a situation where the country could be destroyed at any time, which was equivalent to a hot potato, and even if anyone usurped the throne, it was very likely that he would be ousted from power the next day and take his life.
Why did Liu Chan surrender? Dare to say when Liu Chan surrendered, he never thought of surrendering before others hit his door, when Liu Chan surrendered, the Shu state was already powerless to fight. At that time, Deng Ai had already fought in front of Chengdu, Jiang Wei was still unable to return from outside, Zhuge Liang's son Zhuge Zhan had also been killed in battle, Chengdu had no soldiers and no generals, it was a situation where there was no resistance at all, what if he did not surrender? Waiting to die? If you can't survive yourself and still have to burden a group of officials, is it wise to resist until you die?
Moreover, regarding "happy not thinking about Shu", I think this is the smartest thing Liu Chan has done. "Le Bu Si Shu" is actually not what Liu Chan himself wants, but Sima Zhao wants Liu Chan to "enjoy not thinking about Shu". If Liu Chan did not show "happy not thinking about Shu", how could sima Zhao be at ease? Maybe the door will die. This is the last resort.