Why so you think Percy sends Medusa's head to mount Olympus?

Percy sends Medusa's head to Mount Olympus as a symbolic act of justice and a means to protect others from her deadly gaze. By doing so, he ensures that her threat is neutralized and that her power is contained, preventing her from harming mortals and demigods alike. Additionally, it serves to demonstrate his growth as a hero, taking responsibility for the challenges he faces and using his victories to benefit the greater good. This act also reflects the ongoing conflict between the mortal and divine realms, highlighting the complexities of their interactions.