He's objective was to save all of Eldia. That's why he said him to fullfill his mission in order to bring back "Eldia's dignity". Whose Eldians were more deprived of their dignity, those one the island, or those who were caged in internment zones and forced to wear armbands and live in poverty ?

If he really would have no problem with his Eldians be slaughtered for the benefit of those on the island whom he never met nor interacted with, then he's a bitch ass who should never be put in the same category as Floch.

Floch would never throw away the lives of the Paradis Eldians by being ok with their extermination if it meant Eldia was restored beyond the island.