One-night entire clan was massacred and who the responsible was not the enemy from the village. It was done by itachi Uchiha
Why itachi Uchiha kill all people their own clan or was there something darker reason and behind the Hidden leaf village.
The story was started when the Nine-tail fox attack the Hidden leaf village. and that moment 4th hokage(Yellow flash of hidden leaf village) was there to protect the village and nine tail fox was controlled by Uchiha clan member form that moment Uchiha clan was suspicious.

The Uchiha clan was planning a coup d'état against hidden leaf village. the situation become dangerous because war will be start inside the village. but itachi was caught between two side one of there family member and clan and other side hidden leaf village.
Itachi Uchiha was also member of black ANBU to protect the village from war and trying to find another solution to stop the bloodshed in the village. itachi planned with shushi Uchiha but that moment donzo attacked shishui Uchiha and stole his one eyes.
In that moment, one option was left to stop the coup: to eliminate his own clan member. the clan. But there was one person Itachi loved most: his own brother Sasuke Uchiha.
Itachi sought to hate him and grow stronger to protect himself and take revenge on the clan and family. This is a hard, complicated story of Itachi Uchiha. It is not easy to kill one's own clan and family members, especially his little brother. He carried that burden alone for years, allowing the entire world to see Sasuke that he was a villain.
But the truth is he was a hero who protected his village and the little brother he loved most.

Frequently Asked Questions
Why did Itachi Uchiha kill his own clan?
Itachi Uchiha killed the Uchiha Clan because of the conflict surrounding the planned coup d'état and the threat of a civil war inside the Hidden Leaf Village.
Why did Itachi spare Sasuke?
Sasuke Uchiha was the person Itachi loved most. Itachi wanted Sasuke to survive, become stronger, and eventually take revenge for the Uchiha Clan.
Who attacked Shisui Uchiha?
Danzo attacked Shisui Uchiha and took one of his eyes, which affected the plan to stop the Uchiha coup without bloodshed.
Was Itachi really a villain?
Itachi allowed the world, including Sasuke, to believe that he was a villain while carrying the truth about the Uchiha Clan massacre alone.
What is the Uchiha Clan massacre?
The Uchiha Clan massacre was the night when Itachi Uchiha killed members of his own clan as part of the events surrounding the planned coup against the Hidden Leaf Village.
