I need a thesis statement and explanation for how Victor's crimes are greater in "Frankenstein."In addition greater means in quantity, in affecting the society etc..
First you need to decide what you believe about Victor's crimes. A thesis is usually a statement in 1-3 sentences which is controversial--you could go either way with it, but you, the author, take one side or the other. You need to be clear about the side of the fence you are on--do you agree or disagree, and why? Obviously the audience members who will be easiest to persuade are those who are sitting on the fence--they are undecided or haven't given much thought to the statement you make.
So, do you believe Victor's crimes are greater than the creature's? If so, why? What examples can you give from the novel that will support and help prove your argument? You will need specific examples from the beginning, middle, and end of the novel to show that he has been guilty all along or that even though he realizes the extend of his faults he realizes it too late to do any real reversal of the overall effect on society.
Likewise, if you don't think Victor's crimes are greater, you must focus on why you think the creature's crimes are greater--with the same examples and quotes from the book to support your argument.
I would focus on responsibility to family, friends; responsibility to humanity; the ethics of playing God; ethical and moral behavior toward the "children" one creates; etc. From all of this, you should be able to formulate a thesis which will lead into a paper you enjoy writing.