What would be a strong thesis about blackmail in A Doll's House?I need some suggestions for writing a paper.

It is Krogstad's blackmail that drives the play to its
dramatic climax and conclusion; therefore, it is certainly an important element in the
play. In considering a thesis, think of the irony in Nora's being blackmailed. What at
first seems to her to be a terrible disaster turns out to be the force that finally
frees her from an empty marriage and a meaningless life. Krogstad's blackmail leads
directly to Nora's realizing the truth about Torvald's character. Her husband, she
realizes, is a completely self-centered man who does not love her or feel any concern
for her, at all. Had she not been blackmailed by Krogstad, Nora might never have
discovered the truth and found a new life. Ironically, blackmail in the drama proves to
be Nora's path to freedom, self-respect and personal fulfillment, a blessing in
disguise.