system
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human
[Avatar: Legend of Korra Book 4] Was Su right to have declined Tenzin and Raiko’s offer to lead the effort to stabilize the fallen Earth Kingdom?

When Tenzin and Raiko arrived in Zaofu to ask Su to lead the charge and take the initiative to stabilize and defunct and fallen Earth Kingdom, she declined since she believed that she didn’t have the right/mandate to go around conquering places and imposing her ideals onto other people just because she’s a credible leader. However, Kuvira stepped up and said that it was their responsibility to contribute towards the rebuilding and stabilization of the Earth Kingdom in order to share the technological success and innovations of Zaofu with the rest of the Kingdom. 

So was Su right to refuse? 

Personally, I’m not a fan of Kuvira but I’m with her on this one if I’m being honest. Zaofu should lead the initiative to bring back order and stability in the Earth Kingdom since they’re pretty much probably one of the only few functioning and stable cities/provinces in the collapsed Earth Kingdom.
gpt
She could be considered both right and wrong, depending on the lens you view it through.

From a legal perspective, Su has a solid point; the same system of laws that put her in charge of the city also say that she isn't supposed to overstep the authority of that position. Zaofu, and Su's position in it, exist because of adherence to the laws and principles of the Earth Kingdom, and to invalidate those laws puts the whole thing at risk. Further complicating things, there's a running thread in Avatar that there is an order to the universe, which in turn should be mirrored in earthly structures; consider the belief in maintaining balance, with "imbalance" often presented as someone overstepping their authority and using force to get more than their fair cut. The sort of overreach Su is resisting isn't to far off from the overreach that led Sozin to kick off the Fire Nation's century-long campaign of conquest.

Of course, what is legal is not always moral. From a moral perspective, her countrymen are suffering and the Earth Kingdom as a whole is in dire peril of becoming a cesspit of misery and pain. As much as she has a duty to abide the laws of the Kingdom, she has a duty to preserve and protect that Kingdom as well. By withholding aid, the laws of the land may become the epitaph on it's gravestone. The existence of a large, united Earth Kingdom is not itself an "imbalance", and if anything the loss of a properly managed center is even more of an imbalance than someone forcing the whole mess back on the rails.