sasuke becomes evil because madara uchiha told him the truth about itachi and why he assassinated his clan and the truth was it was a mission from the hidden leaf village so he became a member of the akatsuki to destroy the hidden leaf village
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Sasuke becomes driven by vengeance and a desire for power after experiencing traumatic events and witnessing his family's murder. These experiences fuel his anger and resentment, leading him down a path of darkness and revenge against those he believes responsible for his suffering.
Sasuke turned down a dark path seeking vengeance and power after the Uchiha clan massacre, carried out by his brother Itachi. He felt betrayed and sought to avenge his family's death by any means necessary, leading him to allying with the villainous Orochimaru and pursuing a path of revenge and hatred.
Sasuke Uchiha learned to use the three tomoe Sharingan in Part I of the Naruto series, and later unlocked the Mangekyou Sharingan after Itachi Uchiha's death. Through further development and training, Sasuke eventually awakened the Eternal Mangekyou Sharingan.
While being evil can lead to desensitization and a lack of empathy, it is not a guaranteed path to becoming emotionally numb. Emotional numbness can result from various experiences, trauma, mental health issues, or coping mechanisms. It is important to seek professional help if you are experiencing emotional numbness, regardless of the cause.
Once sentience is achieved human kind has always sought after more than their meager existence allowed, greed for material wealth and by extension power. Evil is in this world because some men forsake their humanity and become monsters, all for the sake of wealth and power. There are also lesser evils, like murderers and thieves, these people often have mental illnesses, were abused as a child or had some sort of traumatic experience, either that or they were simply born in an environment that promotes evil. Evil births evil, as does good births good.
Sasuke hated Itachi because he was manipulated into believing that Itachi had betrayed and killed their clan out of malice. Itachi's true intentions were revealed later, but by then the damage had been done and Sasuke's hatred had consumed him. Even if Itachi's actions were meant to protect Sasuke, the hurt and trauma caused by the perceived betrayal were too deep for Sasuke to easily overcome.