* Revenge: The creature is deeply resentful of his creator, Victor Frankenstein, for abandoning him and leaving him to fend for himself in a world that rejects him. He sees William's murder as a way to inflict pain on Victor, whom he believes is responsible for his suffering.
* Misunderstanding: The creature is a complex and often misunderstood character. He is capable of great love and empathy, but he is also deeply lonely and isolated. He sees William as a symbol of the happiness and acceptance that he craves but can never have. By killing William, he is lashing out at the world that has rejected him.
* Manipulation: The creature is cunning and manipulative. He knows that Justine is a kind and innocent young woman, and he uses this to his advantage. By planting evidence on her, he is able to frame her for the crime and ensure that Victor will be further tormented by the death of his loved ones.
It's important to note that the creature's actions are not entirely driven by malice. He is also acting out of a deep-seated need for connection and belonging. By framing Justine, he is trying to create a sense of chaos and disruption that will force Victor to acknowledge him and, perhaps, finally understand his pain.
Ultimately, the creature's actions highlight the complex relationship between creator and creation, and the devastating consequences of abandonment and rejection.