HaKatan: The notion of Zionism to which most frum people object, the Zionism from Herzl to Ben Gurion, is largely extinct now. There are very few who believe in Zionism as its own cause, as an independent state for its own sake- the nearest possible belief would just be simple patriotism and pride in one’s country, as many Americans, Britons, Mexicans, etc have for their own countries. The belief as it was thought of by Israel’s original settlers is pretty much dead- think of its great symbol, the kibbutz- it’s pretty much dead. There are almost no (if there are any at all) traditionally-run kibbutzim in Israel right now- most of them now have families living together, with personal possessions, much higher living standards, and residents working outside the kibbutz (they hire foreign labor to work the fields). The socialism that birthed Zionism is dead, which means that most of the MO (and not) Jews who celebrate Israel do not come under the label of “Zionist” that you revile so much.
Sam2: From my impression of people I know who are affiliated with YU and celebrate Yom Ha’Atzma’ut (though the person I know does not say Hallel, so far as I’m aware), they celebrate Tuesday.