Despite the sheepish and unconstructive attitude displayed by the Bajorans as a whole, Kira chose to do something and fought. I don’t think that she realized what she was fighting for, she did it out of childish defiance, she joined the Resistance at the age of twelve so she is a typical example of a child soldier. Later, she tried to compensate for her shortcomings in all other spheres of life. She was 26 when the Occupation was over so she had spent about 12-14 of her life in killing and hating. I don’t think that it was plausible for her to overcome her hate more quickly. Still, at times her radical approaches, lack of interpersonal skills and quick jumping to conclusions were too much to bear.
I like “Duet” in terms of acting very much, there were good dialogues, true intensity and clash between the characters involved. Never liked it as a message because it presented an oversimplification of the Nazi-cliché and served nothing but to cement the Bajorans’, and by extension, the viewers’ blind hatred towards Cardassians.
Kira’s reaction was the most normal one, having in mind her past as a Resistance fighter. Marritza’s decision to take the responsibility for what a dead camp overseer had done was far-fetched at the best. In what way would his deed improve the dialogue between Cardassia and Bajor, had his mimicry remained undetected? Cardassians would consider it an act of revanchism, just another proof that the Bajorans were not to be trusted and Bajorans would fixate on their plights during the Occupation instead of trying to develop a more secular and cosmopolitan outlook. Both nations would keep circling forever in their past frustrations, blaming each other endlessly.
After all, this was the first season, the producers did not know how much exactly to vilify the Cardassians and whether they might not need to drink water from the well they spat into, so the Holocaust allusion was a handy but rather cheap way-out.