She cried for Marritza, was friends with Ziyal, "daughter" to Tekeny, and became a resistance fighter for Cardassia. I'd say she learned the lesson you mentioned.
This! Plus, I believe she also came to very much admire Damar. Kira's learning/healing arc is one of the best on this show. Most people with a past like hers would not be as willing to open their minds to loving or having sympathy for any Cadassian. But Kira did! That's amazing stuff.