Ibsen perhaps saw Nora, Rank and Torvald as victims of corrupted Norwegian society, subsisting in a doll's house. Certainly Mrs. Linde and Krogstad are society's victims. What's needed in Norway is a stocktaking, followed by a new start, and Mrs. Linde and Krogstad show the way.
For me a highpoint of A Doll's House is the decision by Mrs Linde, of all people, to let Krogstad's exposé lie in the Helmer letterbox.