Why did the nine-tailed fox attacked leaf village?

The Nine-Tailed Fox, Kurama, didn't actually attack the Leaf Village on its own. It was controlled by the villain, Obito Uchiha, who was using it as a weapon to achieve his goals.

Here's a breakdown of the events:

* Obito's Manipulation: Obito, under the influence of Madara Uchiha, wanted to trigger a war between the villages. He used his Sharingan to control Kurama and unleashed it upon the Leaf Village.

* The Fourth Hokage's Sacrifice: The Fourth Hokage, Minato Namikaze, confronted Kurama to protect his village. He successfully sealed the beast inside his newborn son, Naruto Uzumaki, sacrificing his own life in the process.

* The Consequences: The attack caused immense destruction and left a lasting scar on the Leaf Village. It also instilled a fear of jinchuriki (people who host tailed beasts) and led to Naruto being ostracized for a while.

In short: The Nine-Tailed Fox attack on the Leaf Village wasn't the result of the beast acting on its own. It was a deliberate act of violence orchestrated by Obito using the power of Kurama for his own manipulative ends.