Why did Alonso and Antonio not kill Prospero and his daughter?

Alonso and Antonio refrained from killing Prospero and his daughter, Miranda, largely due to the transformative power of remorse and the supernatural elements at play. Throughout the narrative of Shakespeare's "The Tempest," they confront their guilt and the consequences of their past actions, leading to a change of heart. Additionally, Prospero's magical control over the island and its spirits creates a sense of fear and awe, compelling them to reconsider their violent intentions. Ultimately, their decision reflects a desire for redemption and reconciliation rather than further violence.