During the Three Kingdoms period at the end of the Eastern Han Dynasty, when Cao Cao captured Lü Bu in Xia Picheng, in the face of two of his generals, why did Cao Cao kill Gao Shun and accept Zhang Liao's surrender? And look at the author's detailed analysis.

First, Gao Shun was killed because of his foolishness. This man was a general under Lü Bu, ranked as a general in Zhonglang, very good in terms of ability, he led Lü Bu's most elite troops to "trap the camp" to fight everywhere, it can be said that the battle was invincible and invincible, he quelled the rebellion of Lü Bu's old department Hao Meng, directly advised Lü Bu, and made some good suggestions, but Lü Bu hated Gao Shun's advice, did not reuse him, only every time he fought a war, he handed over the military power to Gao Shun, and then put away the military power, the battle was won, Gao Shun did not get a reward, but he had no complaints. After the defeat of the army, he was arrested by Cao Cao, who directly ordered him to be beheaded.
Because Gao Shun's loyalty to Lü Bu led to his final tragic end, Gao Shun's approach can be described as foolish loyalty, because his foolish loyalty, even if he has a strong ability to command troops, can not be used by Cao Cao, since this is a useless person, it is better to kill directly, so as not to breed trouble.
Zhang Liao was used by Cao Cao because he was not foolish. Zhang Liao grew up in the northern border area of the Han Dynasty, and later led troops to accept the leadership of He Jin, when He Jin asked Zhang Liao to go to Hebei to recruit troops, Zhang Liao recruited more than a thousand people, and before he could return to Beijing to resume his life, he heard the news that He Jin was killed by eunuchs, in order to avenge He Jin, Zhang Liao followed Dong Zhuo again, did not expect dong Zhuo and Lü Bu to have infighting, after Dong Zhuo was killed, Zhang Liao turned to Lü Bu and followed Lü Bu to the south to fight in the north.
In the Battle of Xia Pi, Cao Cao defeated Lü Bu, Zhang Liao led his troops to surrender without a fight, then look back, when Lü Bu killed Ding Yuan, Zhang Liao did not have the intention of raising troops to avenge his lord, and when Dong Zhuo was killed by Lü Bu, Zhang Liao did not rise up to resist, but directly led his troops to surrender Lü Bu, Ding Yuan had the grace of knowing Zhang Liao, Dong Zhuo was still Zhang Liao's immediate superior, but whether Ding Yuan was killed or Dong Zhuo was killed, Zhang Liao behaved very calmly, and finally he surrendered to Lü Bu without a word.
Cao Cao captured Lü Bu, Zhang Liao did not lead the troops to escape, nor did he attack Cao Cao to avenge Lü Bu, but directly led his soldiers to surrender to Cao Cao, which shows that Zhang Liao was not foolish and loyal, and Cao Cao did not care about the past and accepted his surrender. Then he could serve Cao Cao, of course, Zhang Liao's approach itself was not wrong. He successfully chose the right duke and became one of the important generals of Cao Wei.
The lord and the courtiers are originally mutually beneficial and mutually helpful, the lord is wise, the subjects are willing to surrender, the subjects are talented, and the lord is willing to win over. Cao Cao as a generation of tyrants, the vision of people is very unique, from Zhang Liao's great defeat of Xiahou Huan and the surprise attack on Xuzhou City, he saw Zhang Liao's outstanding military ability, of course, Gao Shun also fought a lot of victories, the performance is also particularly prominent, but with Gao Shun's foolish loyalty, Cao Cao can not keep him, he is jealous, there will be no time bomb around, so the person who can reuse it must be Zhang Liao.