Tribes:
Stop splitting hairs. Yes, you are correct in that any call for the return of the 6 northern counties to the Republic would be a dissolution of the "United Kingdom of England, Scotland and Northern Ireland." The IRA provos did, indeed, seek to dissolve that union.
However, what the poster really meant -- which you are aware -- is that the IRA had no designs (offically at least) on Scottish or English territory. Hamas (or at least notable elements thereof) really would prefer for ALL of Israel to cease to exist.
Now, you could dig into the motivations of some of the IRA/Provo/Splinter IRA groups and argue that they were part of the Soviet expansion of communism effort, and that success in the 6 would only have led to a pause followed by efforts in England and Scotland, but I think that level of detail was a bit beyond what the poster intended in drawing his analogy.
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