Yeah - I'd say anti-Zionist Jews are pretty much on the fringes. The vast majority of secular and Reform Jews are pro-Israel, as are the majority of orthodox Jews. That being said, there may be a sizeable minority of non-Zionist orthodox Jews, but that's not the same as being "totally against Zionism". What I mean is maybe they don't feel it was time to re-establish Jewish soverignty in the Land of Israel (you must understand: ALL orthodox Jews want to see an Israel under Jewish rule - the only disagreement is regarding how soon), but most of those Jews, now that Israel is a reality, they don't want to see it destroyed.

No, actively anti-Zionist Jews (and I don't know where you're getting "many sects" from - personally I can think of one or two) are a minority within a minority. That is to say that, other than a handful of Jewish communists or other heretics, they're primarily found among orthodox Jewry, who in turn are a minority among the Jewish people (sadly). The only reason you've heard of them is because they get a disproportionate amount of press coverage - so much for the Zionist media conspiracy.

So again, the majority of Jews are Zionists. Of those Jews who aren't Zionist, the majority are what I would call Zionist-neutral. That is, they're not necessarily supportive of the Israeli Government, but they don't want to see it destroyed. The remainder, the anti-Zionist Jews, are out on the fringes of Jewish society. The idea that liberal Jews are Zionists while religious Jews automatically oppose Zionism as a matter of principle is an increasingly common misconception. There are far more "Religious Zionists" than there are anti-Zionist Jews.

Sorry to burst your bubble if you were looking for a friend in Neturei Karta. There's like maybe a dozen of them, and apparently they go spend all their time going around making kissy faces with murderous dictators. And any Jews who openly embrace people who participate in or advocate the killing of other Jews are pretty much outcasts to the rest of us, the same way someone who betrays his country be giving support or comfort to that country's enemy is a traitor. Personally, I'm of the school of thought that holds that traitors ought to be hanged. But in the case of anti-Semitic Jews, I guess kareis ("excommunication") would suffice.

EDIT: Oooh, controversy, I like that. Is it because I said that actively anti-Zionist Jews are a fringe minority (which is true)? Or is it because I said that treason should be punishable by death (my opinion - and not a terribly controversial one, since in most countries that's how they punish treason)?