Here's why this is the inciting incident:
* It sets the story in motion: Before this, Percy is a troubled teenager struggling in school and unaware of his true nature. The accusation forces him to confront his demigod heritage and embark on a quest to clear his name.
* It introduces the conflict: Percy is thrust into a dangerous world of gods, monsters, and other demigods, facing the consequences of his father's actions. He needs to find the real thief and prove his innocence, leading him to a journey filled with trials and challenges.
* It establishes the stakes: The theft of Zeus's lightning bolt threatens to spark a war between the gods, and Percy's actions could have far-reaching consequences for both the mortal and divine worlds.
This incident is crucial for setting the stage for Percy's adventure and the unfolding of the entire story.