Why did Li Ding kill Xu Wenqiang?

According to the plot of the TV series "Shanghai Beach", the reasons are as follows:

1. The personal relationship between Li Ding and Xu Wenqiang is very complicated. Li Ding was originally an ordinary citizen who followed Xu Wenqiang to the peak of Shanghai's power. There is a deep brotherhood between them. With the promotion of his position, Li Ding's inner vanity and power desire gradually gained the upper hand. He was unwilling to give up everything he owned, including his brother Xu Wenqiang, who had helped and promoted him.

2. Li Ding's loyalty to Feng Jingyao. After Xu Wenqiang and Feng Jingyao turned against each other, Li Ding chose to be loyal to Feng Jingyao and parted ways with Xu Wenqiang, which reflected Li Ding's desire for power and insistence on status.

3. Eliminate potential threats. After Xu Wenqiang's Jason Wu Club was eliminated, Li Ding thought that Xu Wenqiang had become a potential threat to himself. In order to control Shanghai, Li Ding decided to get rid of Xu Wenqiang.