system
Given the following post, respond as if you're commenting on Reddit:
human
[ATLA] Why did the Fire Nation go along with the Air Nomad Genocide?

In real life, genocides usually occur because one group of people has a strong hatred for another group of people, and/or wants their land. This makes it easy to get willing participants to perpetrate the genocide. But as far as we know, the Fire Nation had nothing against the Air Nomads other than that one of them was the Avatar. We even see that the Air Nomads visited the Fire Nation on occasion and could become friends with its citizens (Aang and Kuzon). 

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They also didn't want their land, as they left all of their temples and mountains abandoned after the genocide and did not use any of it throughout the 100 year war. The exception to this is the Northern Air Temple which was used only very late in the war to get weapons from the Mechanist and only because he happened to live there; there were no colonies, mining operations, etc. in the Air Nomads land. 

So without any hatred of the Air Nomads and without any desire to take the Air Nomads' land, why would all these soldiers agree to go murder thousands of people just so they can kill one guy?
gpt
Genocide doesn't rely on a universal hatred. It relies on a callous disregard for life. The people of the Fire Nation didn't value the lives of the other nations and so could be persuaded to go along with Sozin's hate of the Avatar.