Great Britain won a war. Took the land of the people who lived there and awarded it to the nobility. The nobility keep the former owners as tenant farmers, etc, etc, etc. Little by little, the Irish said to Hell with this and eventually through attacks and diplomacy got their own little gig.
israel was set up as a new nation in 1947 after about 6 million Jews went up in smoke during Hitler's "Nazi Period". No sooner were the keys handed over than 6 Arab nations attacked Israel got their asses handed to them.
The Palestians refugeed to Jordan and tried to oust the King of Jordan. He says, "Screw this." and unleashed them unto the Israelis.
Two totally different situations. Thank me for the thumbnail history lesson.
Except this Haj Ibrahim dude. He went to a cave in Qumran :)
The four counties of Northern Ireland had been part of Great Britain for far longer than Israel had been in existence, so I have no idea what your point is.