Why must the hero of a tragedy be neither too good nor bad according to Aristotle?

Aristotle believed that the hero of a tragedy should possess a mix of good and bad qualities to make them relatable and evoke a sense of catharsis in the audience. A hero who is too good may lack depth and realism, while a hero who is completely bad may fail to elicit sympathy or emotional investment from the audience. Striking a balance allows for a more nuanced and engaging character arc.