Why did king Stefan want to kill maleficent?

King Stefan wanted to kill Maleficent primarily due to his desire for power and revenge after she cursed his daughter, Princess Aurora. He believed that eliminating Maleficent would not only protect his kingdom but also rid himself of a formidable adversary. Additionally, his actions were driven by a sense of betrayal, as Maleficent once showed him kindness, which he felt was overshadowed by her dark magic. Ultimately, his fear of her power and its potential threat to his reign fueled his decision to seek her destruction.