Protect, not kill Absolam

Keep in mind
So the king stood beside the gate while all his men marched out in units of hundreds and of thousands. ⁵ The king commanded Joab, Abishai and Ittai, “Be gentle with the young man Absalom for my sake.” And all the troops heard the king giving orders concerning Absalom to each of the commanders.

as we read...

⁶ David’s army marched out of the city to fight Israel, and the battle took place in the forest of Ephraim. ⁷ There Israel’s troops were routed by David’s men, and the casualties that day were great—twenty thousand men. ⁸ The battle spread out over the whole countryside, and the forest swallowed up more men that day than the sword.
⁹ Now Absalom happened to meet David’s men. He was riding his mule, and as the mule went under the thick branches of a large oak, Absalom’s hair got caught in the tree. He was left hanging in midair, while the mule he was riding kept on going.
¹⁰ When one of the men saw what had happened, he told Joab, “I just saw Absalom hanging in an oak tree.”
¹¹ Joab said to the man who had told him this, “What! You saw him? Why didn’t you strike him to the ground right there? Then I would have had to give you ten shekels^[b] of silver and a warrior’s belt.”
¹² But the man replied, “Even if a thousand shekels^[c] were weighed out into my hands, I would not lay a hand on the king’s son. In our hearing the king commanded you and Abishai and Ittai, ‘Protect the young man Absalom for my sake.^[d]’ ¹³ And if I had put my life in jeopardy^[e]—and nothing is hidden from the king—you would have kept your distance from me.”
¹⁴ Joab said, “I’m not going to wait like this for you.” So he took three javelins in his hand and plunged them into Absalom’s heart while Absalom was still alive in the oak tree. ¹⁵ And ten of Joab’s armor-bearers surrounded Absalom, struck him and killed him.
Joab is such a person who does not understand the Father's love. David gave a command and Joab did not follow. A direct order that was refused by Joab. joab was supposed to be gentle with Absalom. To protect this young man, even though they were at war with them. So what is the reason that convinced Joab and eventually caused him to go off course, to kill Absalom instead of proecting him, violating the direct order that David gave him. Perhaps he was blood thirsty, wanting to end this meaningless conflict between both parties? Perhaps he hates Absalom for taking so many of his men? Perhaps he just want credit for the death of Absalom? But David gave him the order. Sometimes, we must really ask ourselves when we are given an order by God, what do we do with it. Do we follow or do we just do what pleases us and not God? just like what Joab done?