Why did the villains always like to brainwash the main character?

There are many possible reasons why the villain brainwashed the protagonist. Here are some possible explanations: The villain himself is not really a good person. He may be affected by some kind of psychological or emotional distortion, causing him to see the world differently from the protagonist. They may think that the protagonist's beliefs and values are wrong, or they may be attracted by the protagonist's actions and thoughts and hope to change the protagonist by telling the opposite. The villain may have some secrets or goals that need to be realized by overthrowing the protagonist's beliefs and values. They may believe that the protagonist cannot understand or accept the message they are trying to convey, so they can only mislead the protagonist by being sarcastic. The villain may want the protagonist to lose his beliefs and principles so that they can control the protagonist more easily. By instilling anti-logic, the villains could put the protagonist under their control and take advantage of the protagonist's wavering and confusion to achieve their goals. There were many reasons why villains brainwashed the protagonist. It could be related to the villain's own psychology and motives, or it could be because the villain wanted to mislead the protagonist to achieve a certain goal.