I know some leftists, some of them that I respect don't like legend of korra. I don't agree with them but that's ok. I just don't think they understand the series is all.

Lets start with book one. The main villian was Amon, a northern water tribe bloodbender who pretended to be a non bender to manipulate people into hating benders. The equalist movement preyed on legitimate grievances though

And by the end of book one a non bender had been democratically elected to lead republic city. So the equalist movement without Amon was actually able to effect some kind of change for the better. Non benders finally had representation and a claim to levers of power.

Its not that the entire movement was bad, its that its leader was a grifter preying on peoples real grievances for his own personal power and with him out of the way their movement actually achieved real changes.

Some would interpret the show thinks that the entire movement was bad and wrong and it explicitly doesnt and explicitly (via Toph later) outright says that each of the 4 villians had valid points Korra could learn from

The entire lesson of the series is that if you let problems get bad enough someone who wants personal power will try to exploit these conditions for themselves.

In book 2 its Avatar Wan's mistake of separating the world from the spiritual world that gives Unalaq the justification for his power seeking. He outright says so and said that the worlds should be connected, hes defeated but Korra ultimately does open the spirit world back up.

So she enacts the justification (undoing the separation) while repudiating his methods and true motives (of really wanting to become a new dark avatar and plunging the world into darkness)

Notice a theme here? The things the villians claim they want wind up happening, but in a way that's actually meaningful and not twisted to suit one persons power trip.

In book three Zaheer claiming to be an anarchist wants to outright end the avatar cycle. He claims to be an anarchist but he doesn't want so much a removal of hierarchies, he just wants anomie. He said he believed the avatar represented unaccountable power.

Well he got his wish but not how he imagined. He was defeated and Korra survived. She was however unable to function for a long time without the help of others. Had she been the unaccountable power he imagined nobody would have helped her when she was powerless.

Also during the battle Korra could not do it alone and needed to help of the air nation. Showing she did have accountability because not even the avatar could operate alone. She needed the world as much as it needed her.

The experience of trauma and recovery becomes its own side story that teaches her a lot about herself and the world. Including a healthy dose of humility.

In book 4 Kuvira arose because of the earth queen being assasinated in book 3 and due to Korra being out of the picture during her recovery. Power vacuums are bad and lead to bad things. Namely Kuvira the fascist using the familiar fascist tactics to aquire power.

Kuviria claimed to have wanted unity but like the others she was just out for her own gains. Namely power and control. That lust for power nearly results in catastrophic destruction from her own hubris. And the earth kingdom did find unity, without her, as a reformed democracy.

Toph's point in showing that each of them had a point was pointing out that real problems existed that these people exploited for personal goals. That actually happens a lot in real life you know.

Sometimes the people telling you that you have a genuine problem offering you solutions don't have your best interests at heart, they have theirs. Probably a good hint is if they say the solution involves killing a bunch of people. Probably a bad solution.