Why did itachi kill his clan

The Uchiha uprising loomed over Konoha like a storm cloud threatening to unleash its destructive fury. Itachi found himself in an impossible position, tasked by the village elders to quell the rebellion brewing within his own clan. In a tragic bid to maintain order, he masterminded the annihilation of the Uchiha, leaving no survivors save for his younger brother Sasuke. Though his hands were now stained with the blood of his kin, Itachi hoped that imbuing Sasuke with a thirst for retribution would steer him away from the clan's insidious plot and preserve the peace which Itachi held so dear. Left alone and consumed by rage, Sasuke set his sights on the legendary power needed to enact his vengeance upon his brother for the family he lost that fateful night.

Itachi, a genius from the Uchiha clan, faced the tragedy of killing his own people.Not from personal hatred or any other reason, but out of a terrible inevitability imposed by the higher-ups of Konoha.They found out that an insurrection was stirring within the Uchiha, targeted at toppling the present regime.To stop a civil war before it starts and to safeguard the village's peace, Itachi took on the dirty work with a heavy heart, also saving his brother Sasuke.

In the anime 'Naruto', Itachi Uchiha, one of the most complex and tragic characters, takes the hard decision of killing his own clan. Why, you may ask? Itachi was instructed to carry out this catastrophic massacre by certain higherups in Konoha village who knew about an impending coup d'etat planned by the Uchiha clan. Itachi, being an ardent lover of his village, chooses the village over his own blood and does the unthinkable. He becomes a scapegoat, carrying the brunt of the blame while protecting the reputation of his village.

Itachi's decision which turned against his clan was no mere one off.He was the village's ace in the hole against a rebellion that his clan schemed up.Bent by Konoha's leaders, Itachi seemed to be in the business of betraying his family in order to silence this internal threat.Whilst he saved off Uchiha's marquee to let Sasuke live and avenged it back on Sasuke later Naive of Itachi's true purpose.

In 'Naruto', this horrifying act was committed by Itachi to suppress the uprising within the Uchiha clan. He was burdened with the task and chose to sacrifice his clan to maintain Konoha’s peace. Notably, he decided to spare his younger brother, Sasuke, allowing Uchiha's bloodline to survive.