It pains me to say this but the sad fact of reality seems to be that the most reputable and worthy Rabbis rather sit quietly and idly by than delve into political, national or even Jewish activism. This is what I believe was as to why the persona of Rabbi Kahane Z"L was more of an aberration. However needed they are, especially in our day where there is such un-Jewishness within, not only the leadership of Israel, but of Eretz Yisrael itself. The anti-Jew diaspora will never change and is to be expected but real Rabbis are needed more now than ever before, in my opinion.
I feel the world is reverting back to the days of 1938 with respect to its antisemitism only today there is a much larger encompass of anti-Jew movements: The Nazis and anti-Jew "White Nationalists", Mohammedan/Islam, Elitist New Utopian Socialist World Order, Communism and the most dangerous Erev Rav anti-Jew undermining Jewry, Judaism and Israel from within...
You are most right. We desperately need more openly active Orthodox Rabbis...