A Zionist is synonymous with an extremist, a radical. They are no different than a KKK member who believes "white people" are the "superior race" and every other race are sub-humans, animals, just bringing their country down when "we could all be so much better if whites ruled everything" (just replace white people/whites, with Jews, and KKK member with Zionist, and you have what a Zionist believes in).

That's the same exact mindset with Zionism, except applied to an elite class of (self-proclaimed) Jews. Zionism is a form of extremism. There are extremists in every group; it would be naive to think there aren't extremists among Jews. There are a good number of people in Israel who are Jewish, know what Zionism is and protest it; you can find this with a simple google (or youtube) search. Zionists hold extremists beliefs and there's a reason even Jewish citizens of Israel are against them.