Frankenstein's main goal after seeing the monster for the first time upon its creation is to destroy it. He is horrified by what he has created, and he believes that the monster is a threat to humanity.
Frankenstein's reaction to the monster is understandable. The monster is a grotesque creature, and it is easy to see why Frankenstein would be repulsed by it. However, Frankenstein's decision to destroy the monster is also flawed. He is not taking responsibility for his actions, and he is not giving the monster a chance to show that it is not inherently evil.