Can someone explain this part of the warriors to me

To preface, I haven’t rewatched the show in about a year, so I might just be missing something. But i’ve been seeing a lot of attack on titan posts so it got me thinking.

so the warriors in marley are Eldian, right? they have to be in order to turn into a titan. Marley uses them as military weapons. But what i’m not understanding is why they are so complicit? like, the marelyns oppress them their whole life, then they get selected to be a warrior with unfathomable titan power. 1st, besides kruger, why has no one ever rebelled? you oppress them their whole life, then give them titan power, and they don’t use it against you? i’d imagine at least a few others besides Kruger would have at least tried

And then; they believe with their whole hearts that the people on the island deserve to die for having Eldian blood. But aren’t they also Eldian? do they think their different because their on the marleyans side? When gabi tells that blonde girl “your ancestors murdered millions of people!” aren’t those her ancestors too?
to me, it makes sense for the average civilian to be scared of eldians because they can turn into giant man eating monsters (even tho only under very specific circumstances) like if I was told there was a race of people like that, i’d be scared too! but the warriors are eldians themselves so i’m not understanding how they are so susceptible to the brainwashing about their own people