From Tumblr user re-blogging-blog:
OKAY BUT HEAR ME OUT:
I know that Legend of Korra is hated and looked down upon by like half the fandom, but can we just talk about the vILLAINs??
Like, we see Amon first, right? The prodigy water/bloodbender who can take people's frikin bending away. Only the Avatar (well, only Aang, really, up to that point) was thought to be able to do that.
Then we see Unalaq, the chief of the Northern Water Tribe fusing with the frikin' spirit of darkness and evil. He wanted to unleash spiritual chaos onto the world for 10,000 years!
Then we see Varrick, another person of the Water Tribe. He was more like a bad guy on the good side, I guess, but technically a villain nonetheless. He was smart enough to make that silly, happy-go-lucky persona for himself. But when Mako starts to dig, we can see the way Varrick looks at Mako. It's a look that knows Mako knows he knows Mako knows.
And then we see Zaheer, an Airbender, Ghazan, an earthbender, Ming-Hua, a waterbender, and P'Li, a combustion/firebender.
What I'm saying is that LoK breaks down the thought that firebenders are the bad guys and everyone else is good.
For most of ATLA, we were shown the good guys being airbenders, waterbenders, and earthbenders. We were shown that fire was destruction (until the Sun Warriors episode) and that water was life (until "The Puppet Master" episode).
LoK doesn't distinguish villains being in only one nation. It showed that villains were everywhere and no one nation was good or bad. It was the people themselves who chose who they wanted to be, and their actions influenced the way the viewers(and the people in the show) saw the nation the villain came from.
This is a generalization, and I think LoK did a pretty good job showing the fact that people are their own selves, and not the face of their respective nations.