system
Given the following post, respond as if you're commenting on Reddit:
human
[Avatar] How did the fire nation kill the entire air tribe but never took out the earth and water tribes?
gpt
In addition to the Air Nomads being relatively small and only having the remoteness of their temples for defense, the Fire Nation killed the bulk of their population during the weeks that Sozin's comet was enhancing their firebending. Even a relatively small company of firebenders would have been able to wreak devastation on their numbers.

With that in mind it points to how much of a badass Gyatso must have been to take down several comet-empowered firebenders with him.