How is it a Milhemes Mitzvah? It’s a fight about money and real estate. Are the Palestinians demanding that Jews stop learning Torah? Do they demand the Jews open their shops and drive their cars on Shabbos? Are the Arabs demanding the Jews wear immodest clothes and engage in lewd behavior (such as women singing in front of men, not to mention many other things we don’t talk about on YWN)? Are they insisting that people other than our gedolim control religious community life (run mikvas, shuls, etc.). Do they even demand we say hallel on their holidays?
The goyim were willing to let Orthodox Jews live in peace in Eretz Yisrael. The war began when the zionists demanded political control (and that the Arabs be reduced to a secondary status). Had the gedolim staying in control, as they were before 1914, there would have been no war. It’s the hilonim’s war – let them fight it. We should worry about our own survival, which is a function of Torah and Mitsvos.