Mr. Kahana definitely did not have the support of the gedolim. Indeed a number of the gedolim specifically spoke against his activities. His Jewish Defense League, Zionism and vocalness were counterproductive to the Jewish community. Quite a number of his JDL colleagues ended up with long prison terms for committing violence. And they helped virtually no one.
Btw, Kahana said a few times that he was safer in the States than in Israel. Yet look at how he left the world.