Who's the Real Monster?

"William, Justine, and Henry--they all died by my hands." -page 136

So who really killed all of theses people? Literally, or maybe a better way to put that is directly, it was the monster. But wait, who exactly is the monster? Victor said this. However, I feel like, through his creation and neglect of the monster, Victor is responsible. It actually kind of makes sense that most people think that Frankenstein is the name of the monster because when you get down to it, he really is. It just really bothers me how Victor created the monster and then completely abandoned him. It was one thing to make the monster, to experiment and discover something that had never been done, but he has to have a sense of responsibility.