I could totally see Dart going on some crazy rant that clearly, the Rhomanian people and Japanese people were too genetically inferior if they took such heavy losses from the plague. Alternatively though, he might blame their governments for being incompetent and not taking the vaccinations seriously enough. "Both Drakia and Russia have larger populations than you and we both got our populations vaccinated in time, so clearly, the problem is on your end."Obviously they were too weak and insufficiently committed to the cause of the Final Society (or in the case of Japan, too racially inferior) and need to eugenics harder amirite
"look we were doing you a service by weeding out the inferiors get over it already"
somehow I get the feeling that will go over real well with people
He might also blame the Alliance for sabotaging the vaccines, which could possibly be rooted in truth. I do hope EBR goes into more detail about why Rhomania did so badly against the plague compared to Russia.