Well...humanity kind of is that evil really. Look at the shenanigans between Israel and Palestine to this day. Same with China and the Uighurs as well. You can prime anyone to be a complete fucking retard and hate an entire race of people based on the past. Hell, look at the DNC faggotry right now, gotta make sure those gosh darn Tumpers never get to own property or money now or Hitler will ressurect dontyaknow.
People are stupid and easy to manipulate if you got the time and money. But still AoT blew its load as a story years ago and is still awful.
You're also neglecting one important fact: Proximity. These people are extremely close to one another. Even if it were Ethnic cleansing like in Africa, they operate on the same land, sometimes even in the same country. Racial hatred and genocidal punishments are not far and away, they're extremely close. They're driven by ideology, sometimes religion and sometimes politics.
Marley wins a complete victory. They have these people at their mercy. If they desired, they could put every one of them to the sword, but instead they banished them. Far away from them on an island where they couldn't generate the numbers to pose a threat. Yet, Marley still tortures them for no fucking reason.
Look, if Marley wanted them dead, they could do it. They're not going to constantly waste time and resources to torture an entire people. Either they're eliminated or in complete submission. They're not close enough for Marley to justify its actions. They don't even share the same land, not to mention they're on an island which would limit their resources in any sort of conflict.
Peoples in history have been tortured, but again, there was proximity. And they would completely eliminate them if they got the chance. They wouldn't be kept around.
So why does Marley do this? Why even bother risking provocation with them if they're so dangerous? Why let them develop advanced weaponry? If you're doing this and hate them THAT much:
Why are they fucking alive? If Marley acted the way it does, Paradis would have been genocided a very long time ago. Typically when there's a dispora or an exile, that's it. Conflict is over. The people you hate are long gone and far away from you. You don't travel and fuck with them constantly and risk provoking a war. That's why they were exiled in the first fucking place.
Marley is so comically evil and sadistic, from its men to its women and its children, it is quite literally impossible to muster up feelings for any of them when they're getting fucking slaughtered. Their actions make no fucking sense. Either they hate them so much and they're so dangerous that they'd kill all of them or they'd just exile them and have a permeant blockade around the island like some countries do. Instead, if Paradis was a bear, you had a guy with an elephant gun and a tranquilizer gun. But instead of killing it or sending it to the zoo, you constantly beat it with a stick and then you get shocked when you are mauled to death. You were torturing the bear, you fucking idiot, you get what you deserve. That's why in history, you either killed everybody or exiled them, so you wouldn't fucking have reprisals.
So Marley's actions make no sense, fail to be sympathetic and there's just no way that they're equivalent to Paradis/Eldia in any respect. The whole Marley angle is so mind-numbingly fucking stupid I honestly cannot care for what Eren is doing to civilians. Because they're not people, they're just caricatures of them.
My issue is that AoT no longer being character driven would've been fine if the plot didn't suck ass. You'd think what's currently happening in-series wouldn't be boring, but it somehow fucking is. Everyone with the single exception of Pieck is a fucking idiot who's seems screwed no matter despite the fact that it shouldn't be like that. The world of AoT makes no fucking sense, and can only work if the following is true:
The vast majority of the entire world are so hateful, petty, sadistic, and/or apathetic, and cowardly that they are perfectly fine with the mass torture, starvation, and genocide of an entire race because of what happened to some pigs over 2000 years ago.
I'm sorry, but I just don't fucking buy it.
Even if it wasn't for the pigs, I still wouldn't buy it. I know I occasionally get made fun of for this on here, but I genuinely do not believe this is true both in-series and irl. There's no fucking way. If not for the fact that humanity isn't that evil, but for the fact people would get bored after a while and find some new victim to target. People would move on after two millennia. This would be like Italians hating modern Greeks for what the ancient ones did to Troy, and hating them enough for them to wanting genocide them all.
That is just not how things work, and the fact Isayama tries to argue that it is even when he had no actual logical reason to, (again, he could've easily just had that not be the case, and just have Eren incorrectly think that) is just fucking insulting to me. That and the fact that he decided to do it in the stupidest, most contrived, and boring way possible.
Tl;dr: AoT not being character driven would've been fine if the plot didn't turn into some racist edgelord's stupid, and boring WWII fanfic.
Well, obviously you need a good plot. Which AoT most certainly doesn't have.
Oh, its completely retarded. There's absolutely no way it makes any sort of sense. It is so contradictory to human behavior. Like I wrote above: They'd either all be dead by now or just living in exile, ignorant of the wider world. There is no point. They're too far away from each other to be viewed in this light and even if they had camps and shit, why aren't those people just strung up and tortured daily?
Marley is retarded and no matter how you slice it, Eren is just right. Because the entirety of Marley are sadistic fucking retards. Like how am I supposed to feel bad he stomped on a city or some shit?
Isayama's main problem is this: If Marley simply exiled the Eldians, there would be no titans on the island. You don't want to remind them of how powerful they could be and figure it out. So no Titans, no story. And if Marley DID hate the Eldians this much, they'd already all be dead. There wouldn't be any left.
Since Marley obviously will never ever leave Eldians alone and don't seem to understand diplomacy since they're all fucking sadists, then yes, the only option is to fucking kill all of them. Normally this would be unreasonable. Since the story is shit, it is the only reasonable outcome. Other than a total retcon.
The problem obviously arises is that no society, rational or otherwise would behave like Marley, so you can't relate to them or understand them. There is no historical or cultural analog. So there's no way to see it from their side, because if you step into Marley's shoes, they're all bug-fuck crazy sadists. The only way you MIGHT have POSSIBLY justified it, is if Marley was a total theocracy and it had something like ten thousand years of punishment for the Eldians or something. But that doesn't fit with Isayama's fucking retarded, idiotic, World War 2 story. God AoT's story is such fucking trash.