if Aang had to kill Ozai he wouldn’t be smiling and waving after Zuko’s coronation, he most likely wouldn’t even decide to try again with Katara, the story would be forced to turn very dark, very fast, and would need to be given time and space to breathe

final minutes of the last episode are not the time to have a character break their core values, not without a season’s worth of set up to get you to that point