Nom, kahane was off because he advocated a nationalistic tough jew, never again mindset which gedolim called kefirah, including the chazon ish. He believed the answer to antisemitism is violence and even terrorism. The state department listed his organization as a terrorist entity for a reason. Granted he didn’t go after civilians, but he didn’t care much about what his actions caused.
He supported an ideology “they must go” which is the definition of ethnic cleansing, which would have made israel not only a pariah, but the subject of perhaps an international invasion from western countries who care about civil rights – including the US.
Not to mention how many jews would be killed if forcible expulsions of millions of arabs took place.
He was essentially a rodef in that regard.
Nothing to do with what my rebbeim said. Actually, one of the people i consider to be my rebbe, rav avigdor milller, reminded people that meir kahana was a shomer torah umitzvos, though he argued sharply against his positions. I don’t know if rav miller knew the full extent of what kahanist ideology would bring to the jewish people. We literally could have had another Holocaust if we followed him.