so i've been practicing my frankenstein dance...

In the end of the story, the monster takes over the narrative and begs for everyone to sympathize with him and understand his side. The fact that the story ends with the monster as the narrator is a symbol of just how much control he had over the life of Frankenstein. Just by his simple existence, he caused Frankenstein to lose control of his own life. Do I think this was entirely the monster's fault? I'm not sure; both are to blame for the events that occured.