Antisemitism is a idea, ideas can live in the minds of people, people reporting from Palestine are antisemitic, therefore killing the journalist was a valid military target.
Even though the journalist, an Arab, is a Semite....
Semite - Wiktionary 2. A member of any of a number of peoples of ancient southwestern Asia and East Africa such as the Akkadians, Assyrians, Arameans, Phoenicians, Canaanites, Hebrews, Arabs, Aksumites, and Ethiopians.