It isn't. You already provided more than enough evidence in your post to support your statement.
IMO, the real problem is that Riot's writing team hasn't given us a proper story or a lore reveal that details Ionia's inner societal & political corruption in a meaningful and in-depth matter yet, like they've already done for Demacia, Noxus, Piltover and Zaun. Sure, we've gotten small notions and mentions that briefly allude to Ionia's inner evils on a surface level - but nothing more than that. And this has been going on for years, to the point where I can't help but think that Riot's intentionally avoiding it for some reason or another. So much so, that they're willing to introduce a second Noxian invasion into the lore that'll undoubtedly continue to push Ionia as some forever-victimized, harmonious, good-guy utopia.
And I don't think it's a coincidence that the factions which received these "moral" grey lore updates/retcons just-so happened to be factions that were strongly based off of western society. And I don't think it's a coincidence that the Ionian champions who just-so happen to have some personal beef with their faction are all of Ionia's seemingly "evil" or "morally-questionable" champions, either. Zed, Syndra, Jhin, Kayn, Xayah and Rakan all have their own varying issues with Ionian society and culture - but I wouldn't consider any of them to be "good" people whose beliefs and views are wholly justified through their actions, as they've all done some _very bad _ things at some point in their lore.
The only one who didn't comply to the status quo was Yasuo, who was forced to kill bounty hunters, his peers and even his own brother entirely out of self-defense. In fact Yasuo's backstory would've provided Riot with a perfect opportunity to explore Ionia's darker side if the murder of his master happened to be inside-job from a rival family clan or dojo... but that didn't turn out to be the case. Instead it turns out that Riven really was the murderer all along and she was just suffering from some half-assed, mumbo-jumbo PTSD delusion. And even then, Yasuo's mentor wasn't acting in self-defense when Riven barged into his temple. She simply asked him to remove the evil curse that Leblanc enchanted into her rune blade. He (surprisingly and unrealistically) obliges and then the blade explodes in his face, killing him in the process. So it all turns out being the underwhelming aftermath of a complete accident.
Eventually one Ionian counsel holds a trial for both Yasuo and Riven in their latest short story, and through a series of borderline laughable events, their jury and judge declare both of them innocent, despite Riven's past affiliations as an important enemy soldier, or the fact that Yasuo killed dozens and dozens of people while he was a wanted man. There's a brief mention a shady priest who tried to frame Yasuo as a guilty man during his short trial, but I doubt Riot's ever going to explore this plot point in the near future any time soon, since they've yet to do the same with any other notable point points that've briefly mentioned anything about Ionia's inner corruption in the past.
Maybe I'm just jumping to conclusions... but it's almost like Riot's terrified at the possibility of potentially offending their massive Asian consumer base by implementing their own innate cultural issues and societal corruption into Ionia's lore. Sounds crazy and maybe even borderline-offensive to some, but I'm just going to assume that this is the case if China's political censorship in movies, games and TV media is anything to go by. Meanwhile most western nations don't really seem to care if a company takes a page or two from the corruption that's prevalent in their societies, governments, economies or social classes and uses it as worldbuilding inspiration for their IP, which is probably the reason why Zaun, Demacia, Noxus and Piltover have clearly defined & explored "good sides" and "bad sides."
