Oh no! Not everyone in the Fire Nation is like that at all. Some of the villagers we met were really nice, if a little bit... odd.

[She pauses for a moment. She can't help thinking about how what she's about to say affects how Zuko might have grown up.] There were soldiers that were terrible, though. We saw a whole fishing village with their water made foul by a factory, and the soldiers took their medicine and the people got sick and starved. I don't think everyone in the Fire Nation is evil and crazy... but the ones who started the war... they killed all the Air Nomads. They captured all of the waterbenders in my tribe. They murdered my mother.

I don't see any reason for anything they did.