Tu Sunhang tried to kill Jiang Ziya before. Why did Jiang Ziya spare him?

I think Tu Sunhang is useful to Jiang Ziya, and Jiang Ziya kept him in order to make Deng Jiugong submit to the Zhou Dynasty and achieve the goal of strengthening national strength. Tu Sunhang wanted to kill Jiang Ziya because Deng Jiugong thought he was very powerful, saying that as long as he could break the Xiguan, he would betroth Deng Chanyu to him. This is why Tu Sunhang wanted to kill Jiang Ziya.

When Tu Sun Hang planned to assassinate King Wu and Jiang Ziya at night, he was discovered by Jiang Ziya and finally caught by Yang Jian. When Tu escaped from the underground, he was easily caught by Liu Xiongsun with his magic. After Tu Sunhang was arrested, Jiang Ziya was determined to kill Tu Sunhang.

However, the henpecked grandson interceded for Tu Sunhang, hoping that he could find something useful for Jiang Ziya in the future. Tu Sunhang tried his best to survive, so he told Jiang Ziya that Deng Jiugong had betrothed Deng Khan to him.

In fact, Jiang Ziya knew that he had to let Tu Sunhang go, because he was moved by his henpecked grandson's words. What makes Jiang Ziya fancy is whether Deng Jiugong can return to Zhou's side. Deng Jiuzhou was a famous general in Shang Dynasty. If he surrendered, people in the Shang Dynasty would feel very scared and scared, which would cause chaos in the Shang Dynasty. If Deng Jiugong can return to Zhou, all his generals will return to Xiqiao, and Jiang Ziya's reputation will increase greatly. Moreover, if the governors see Deng Jiugong's return, they will gather people's hearts and make them want.

The most important thing is the character of Jiang Ziya and Jiang Ziya, because Jiang Ziya likes to submit to others without consuming a single soldier, and such achievements make people feel very satisfied. So, as long as Tu married Deng Chanyu, he could woo Deng Jiugong and greatly increase Zhou's strength. So, what's the objection?