Since my great grandfather fought fought with the allies during WW1 I would guess he wanted to shoot the fuzzy wuzzy ally of the Kaiser. Oh that's Kemal the boy lover was a general in the Ottoman Empire, allies in the Central Powers that included the German and Austrian empires of which Croatia was a part.
From the genocide of Armenians to the Jews and Gypsies and Serbs, it makes sense Croatians would idolize Hitler and Kemal.