Original: Sokka decides to have a simulation fight against a scarecrow, but Aang refuses to kill it due to his pacifistic nature and non-violent upbringing, and even berates his friends as they tell him that he must eventually kill Ozai.
Simplified: All the groupe adviced Aang to kill Ozai, but Aang refuses to kill it due to his pacifistic nature and non-violent upbringing,.