LogFAQs > #938620069

Perfectly innocent people don't really exist, though. And perfectly evil ones are rare (they are the psychopats, I suppose).

Ozai, Azula, Zhao, the villain from Korra S2, they are evil.

Amon is someone who suffered in the hands of an asshole father and decided he could prevent that if he just removed bending from the world.

Zaheer decided the problem was the existance of the state.

Kuvira decided the Earth Kingdom had been robbed at the end of the 100 year war and that it was her job to fix that.

All 3 were fighting for the greater good, the issue is they all decided they have the right to commit crimes and hurt people and destroy the status quo to achieve them.