By making Corelli acutely aware of what the Italians are doing to the Greeks, Dr. Iannis doesn't let Corelli forget that whether he takes the war seriously or not, he's complicit in the violence and the damage the Italians are causing. This impresses upon Corelli the importance of going on to build up his personal relationships rather than his political theories or military prowess, as it's those personal relationships that will get him through the war.