Based on the episode title The Deserter.
It was way too easy to think of Fire Nation as bad and everyone else as good. As Sokka stared down at the man cowering before them, he felt that firm foundation beneath his feet crumble.
Aang let the man go. Of course. Enough begging for forgiveness and the Avatar couldn't resist showing off his mercy. Sokka watched the man run off and forced down the bile rising in his throat.
For the rest of the evening's travel on Appa's back, Sokka kept his back to the others, fighting the urge to vomit and cry at the same time. Chey and Jeong Jeong as deserters, he could approve - that made sense. But what mental disease did you have to have to make you defect to the Fire Nation?