HaKatan and Health,
1. Forty years ago (after the great Zionist victory) a Jew could walk alone and unarmed in any Arab area because the Arabs, like almost everyone else in the world (and this is the fundamental problem the West has in dealing with ISIS) they thought that everyone thinks like them. They knew what they would do if the shoe was on the other foot c”v and they assumed that we would do the same so they feared Jews. If you want us to make them correct you are essentially saying that we should stop being Am Yisrael.
2. ISIS has nothing to do with Israel or Zionism. This is an anti-Semitic lie. They have stated time and again that they are still fighting the Crusades.
3. Many gedolim (e.g. the Netziv, Rav Kook, Rav Meir Simcha, Rav Soloveichik) supported Zionism. Rav Schachter was referring to individuals who have individual heterim. There are also good reasons to eat on Yom Kippur and drive on Shabbat but the default position of the Halacha is that both are prohibited.