Your confusion is extremely understandable and it is really hard to get a goo viewpoint into this exact issue from basically anywhere outside of the Haredi communities themselves. What makes it even harder is that there is not lock-step uniformity among "ultra-orthodox" Jews either in Palestine or outside. Traditionally, all Haredi Jews were anti-Zionist since they believed in the Jewish religion which, itself, is an anti-Zionist faith: some of the biggest offenses you can commit in the Jewish religion are (1) try to establish a Jewish state in the holy land (or even enter the holy land) through any means other than literally waiting for the literal God to literally come back to earth and literally resurrect the King David, thereby re-establishing God's kingdom on earth, (2) stealing anything from anyone, and (3) killing anybody. This is why Jewish communities rejected Zionism for 1800 years even though they knew what it was. HOWEVER, since the founding of the state, there have been massive campaigns to pressure the traditional religious adherents to adopt Zionism, including creation of new religious schools that are based on a Zionist version of Judaism. Making it even harder to distinguish from the outside - several communities of "ultra-orthodox" Jews in Palestine are comprised of former non-Haredi Jews who have adopted more traditional lifestyles while retaining their core Zionism. Add on top of that the general prejudices, racism, reactionism, etc. that already find fertile ground in fundamentalist communities of all monotheist religions, and you end up with a lot of people who look the same, dress the same, and talk the same taking radically different sides of the Zionism issue. However, the traditional Haredi communities who, for example, serve in the Knesset have often been anti-Zionist and, according to them, the reason they serve in the Knesset protect the traditional Jewish religious practice from the secular state that they fear. This has allowed them to ally with (or at least not oppose) genocidal, secular Zionists when they are doing ethnic cleansing in Palestinian territories because the primary concern of these ministers is letting them shut down their neighborhoods on the sabbath or prevent women form praying next to the men at the Western Wall, etc.