She did though. She sacrificed herself to seal Chaos away but when Chaos proved too powerful in the end Sailor Moon exorcised Sailor Chaos from her. Also why does that matter. Nehellenia's people were her own servants that she willingly devoured. Sailor Galaxia was at best driven insane and manipulated by Sailor Chaos. Once more she does bring back all of the Inners, Outers and Tuxedo Mask in the end and promises to return all of the Star Seeds of the other Sailor Senshi she killed so I imagine she will restore the Animamates to their true Good Senshi forms. I see no logical reason why Sailor Galaxia should suffer a bad defeat or a heavy price. In fact if anything again this was more warranted for Nehellenia. Why does it not matter that all of the people she consumed were "nobodies" they were all members of her kingdom.
It has nothing to do with her modern day's killing.
Nehellenia's ppl were nobody to the audience, they have little personality and popularity, like only very little screentime. It's very hard for ppl to feel really bad for them that much. When they were restored, then everything is fine.
The senshi were different, they were all around regular cast, loved by so many ppl. The Inner's death in the first season shocked so many ppl because we love them.
If someone kills them, of course their supporters would want the foe to pay heavily, just like the DD girls and Eudial. Till today I still feel that way.
Again I think it is ridiculous how people think that Sailor Galaxia deserves a "beat down" when it wasn't her fault.
Because it was shown that way.
In fact I would argue that what Nehellenia did was far worse then what Sailor Galaxia did and her Kingdom was only brought back due to Sailor Moon, Tuxedo Mask, Sailor Chibi Moon along with the Inners and Outers as opposed to anything she did or could do. Sailor Galaxia however attoned by herself and in her own power. I by no means think or wanted to see Sailor Galaxia suffer a bad defeat or "atone with a heavy price" and I think that the idea of anyone wanting that is silly and makes no logical sense.
Also Chaos's influence was shown. Chaos was mentioned to have been sealed away and it was shown that the reason for Sailor Galaxia's corruption was due to Chaos's influence and besides the whole thing of Sailor Galaxia being the Legendary Soldier and Chaos being sealed inside her was supposed to be a twist ending.
Chaos was only mentioned, without much clear influence shown until the last moment. He wasn't a real "character" in ppl's eyes, so it's impossible to switch the anger to him.
If you want to let the audience blame him, you need to make it clear like showing Galaxia being possessed in the beginning, or showing Galaxia's true personality much much earlier, to show her struggle, that's how you handle a plot.
I've mentioned Bucky the Winter Soldier before. He was shown to be Steve's good pal, suffered such brainwash, Hydra was also seen as a main threat. Yet still many ppl feel angry when the scene of him killing Tony's parents were shown, and side with Tony.
Imagine if we had none of this setup, having him killing important characters, then reveal that he was good in the last moment, how much ppl would even feel bad for him?
It's very important to understand that you can't just write something good or bad, you need to let the audience feel it. Somtimes killing a thousand ppl doesn't shock as much as killing one.
Again I'm not arguing about is she evil or is Nehellenia much worse, but about how it was presented.