My character on Dwilight (Ezra, Lord of Shinnen) is an Ambassador and has been trying to mitigate the penalties from having a sympathetic populace.
It seems like sympathy to every realm slowly creeps back up despite the efforts of our realm's diplomats. For example, 4 turns ago Shinnen is very loyal to D'hara and like Fissoa (both realms at war with Luria) according to the diplomacy report. This turn, they are deeply devoted to D'hara and very loyal to Fissoa. From reports I've gotten around our realm, it seems like the sympathies to every realm on the island slowly creep upward.