Naw I'm on team fuck the rest of the world. They had a big rally and everything to announce the genocide of a people. They can all be flattened for all I care, save as many eldians as possible and kill the rest.
I just re-read chapters 99 and 100. Just to clarify, the rally was not to genocide the Eldians, it was to defeat Paradis Island before they could use the Rumbling against the World. It is less motivated by genocide and more by the fear of the Rumbling.
Yes, there are people who think the Eldians should be eliminated, as it was discussed between the warriors, but as far motivation for this war goes, the goal is to defeat Paradise, Eren in particular, and stop the Rumbling. If anything, I think Tybur and Margath's plan is to save the Mainland Eldians at the expense of the Paradis Eldians, since the attack on Liberio gathered a lot of sympathy from the world for the Eldians victims of the attack.
BTW, I'm not advocating for Marley. They were the ones who started the whole mess by invading Paradis, after all, but I do not think the entire country, or the rest of the world, deserve to be genocided. Specially if the Eldian Empire did terrorize the world in the past.