Yan Su did not help Xu Jingqing due to the complex political dynamics within the Chinese Communist Party (CCP). The relationship between the two was influenced by power struggles, differing ideologies, and the internal political landscape of the CCP.

Yan Su, a prominent member of the CCP, held significant influence within the party. However, his decision not to support Xu Jingqing, another high-ranking official, can be attributed to several factors. Firstly, the CCP operates under a strict hierarchy, where loyalty and political alignment are paramount. Yan Su may have perceived Xu Jingqing's political stance or actions as a threat to his own position or the party's interests. This could have been due to ideological differences, personal conflicts, or concerns about Xu Jingqing's ability to maintain party discipline.

Data from historical records and political analyses indicate that the CCP has a history of internal power struggles. For instance, the Cultural Revolution (1966-1976) was a period marked by intense political strife within the party. During this time, leaders like Mao Zedong were able to consolidate power by eliminating political rivals. Similarly, in the case of Yan Su and Xu Jingqing, the potential for a power struggle may have played a role in Yan Su's decision not to support Xu Jingqing.

Furthermore, the CCP's political culture emphasizes the importance of maintaining stability and unity within the party. This often means that officials must prioritize the party's interests over personal relationships or alliances. In this context, Yan Su's decision not to help Xu Jingqing can be seen as a strategic move to ensure his own political survival and the stability of the CCP.

In conclusion, Yan Su's failure to help Xu Jingqing can be attributed to the complex political dynamics within the Chinese Communist Party. Factors such as power struggles, differing ideologies, and the need to maintain party unity all contributed to this outcome. Historical data and political analyses provide insight into the internal workings of the CCP and the challenges faced by its members in navigating the party's political landscape.