I think it’s because of gods or just what you believe
Readers in this part of the novel feel sympathy for the monster and believe that he is a victim of the circumstances. The monster cried and expressed remorse when his creator died which means he is not more hateful but as it is mentioned in the passage before he regrets what he did. The theme of duality is present in the whole novel since the creature is not bad at the beginning but people reject him due to his appearence and then the creature starts to kill people which means that he changes and becomes bad.
