Historically this region suffered from settler colonialism where Britain encourage Protestants to move into the area. If you wanted to make a comparison to anti-Zionism, then the Nationalist‘s fight for civil rights and political representation is much more apt, then Protestant hardliners wanting to keep the demographics in their favor in order for continue suppress the rights of Norther Irish Catholics.
Ironically, the IRA were not afraid to use terrorism to further the nationalistic cause (similar to a certain Palestinian resistance movement), and when the British tried to defeat them militarily (including via occupation) it only made matter worse. What did work however was stopping these policies which stripped Catholics from their civil rights, and granting them a political avenue for their prospects. Turns out that if you have political means for your goals, you are less likely to use terrorism.