It really took effort to get Kakashi to hate someone.
When Sasuke left for Orochimaru Kakashi didn't hate him. What he felt was actually closer to pity, because he knew Sasuke wouldn't have fond memories of his time in Sound.
No, Kakashi didn't hate Sasuke when he refused to come back to the village, even after he had killed Orochimaru.
Sakura had felt strongly about it, but she just wanted what was best for him. Deep down Sakura may have loved him still, but that was only on good days.
She had moved on, and gone to others to find love before settling her heart with Kakashi. She had been eighteen and far more stubborn than him.
Kakashi probably wouldn't admit this to anyone but her, but Sakura was the best thing that had ever happened to him.
So when Sakura returned from their latest attempt to retrieve the Last Uchiha badly injured coupled with severe blood loss, Kakashi was pissed.
Not at Sakura, never at Sakura. He has held her as tightly as possible when she had finally staggered through the village gates.
He knew it had been a bad idea for her to go off with Naruto while he was on a mission.
He spent the night with her at the hospital, cuddling with her all night in those uncomfortably small beds.
Kakashi loved Sakura.
It was Sasuke who he now hated.
It was Sasuke who he was going to beat to death.
Almost anyway. He was sure Sakura would appreciate it if he didn't kill her former team member.
But he was going to let the brat know exactly how he felt, before tying him up and delivering him straight to Tsunade. That alone would be punishment enough, especially if the fifth Hokage was drunk again.
Kakashi grinned and nuzzled into the base of Sakura's neck. She was asleep and they were effectively sharing the hospital bed by spooning together. Closing his eyes, Kakashi tightened his arms protectively around his love.
No one was going to hurt her and get away with it, not while Kakashi was still breathing.