Kakashi didn’t Kill Rin Nohara. There is a lot within this incident. Rin Nohara was the comrade of Obito and Kakashi, so Kakashi would have hardly killed her.
It was the plan of Madara Uchiha. Madara wanted a pawn to fulfill his dream, the dream of Infinite Tsukuyomi. So he decided to make Obito Uchiha his disciple. For that, he framed the entire plot of Rin getting killed.
Madara used mist Shinobi to get Rin Nohara kidnapped and later on they implanted Three tails within Rin. They wanted Rin to destroy the leaf village.
However, Kakashi finds out Rin missing and he goes on a mission to find her. Upon making it to the place where Rin was kept, Kakashi used his “Chidori ” and killed all mist Shinobi.
Amidst this, Rin wanted Kakshi to kill her. She didn’t want to be the cause of the leaf village’s destruction. However, Kakashi didn’t agree with her and wanted her to stay alive. When Kakashi was fighting with mist Shinobi, Rin jumped in and let herself get hit by Chidori. Chidori pierced her heart and Rin dies.
As Madara’s plan was working well, he somehow brought Obito to the place, exactly at the time when Kakashi’s hand was through Rin’s heart. Obito thought Kakashi was Rin’s murderer and he started despising Kakashi.
Through this, Madara was success in his plan and made Obito his disciple.
It was not Kakashi who killed Rin Nohara. Rin herself committed suicide for the sake of her village. Later on in the anime everyone thought, Kakashi killed Rin for his mission’s sake but that was not the case.
Based on that incident, Kakashi Hatake quotes an axiom, which is as follows,
“In the Ninja World, those who break the rules are scum, That’s true. But those who abandon their friends are worse than scum”Kakashi Hatake
Did Kakashi kill Rin, or did she commit suicide?
Kakashi didn’t kill Rin. She committed suicide by jumping in front of the Raikiri used by Kakashi again to mist Shinobi.
Why did Rin want to die?
Rin wanted to die to save Leaf Village from the attack of three tails, which were implanted within her by mist Shinobi.
Who was the sensei of Kakashi, Rin, and Obito?
Minato Namikaze, also known as the “Yellow Flash of the Leaf,” was the sensei of these three.
Who was the main mastermind behind the kidnapping of Rin Nohara?
Madara Uchiha was the main mastermind behind the kidnapping of Rin.