@georgeob1,
The comparison between the Israeli/Palestinian conflict and the Protestant/Catholic conflict in Northern Ireland has very limited application.
No matter how violent and extreme the clash between The IRA and The Unionists was, it was not existential.
If the Protestants had desired to and been successful in driving the Catholics from Northern Ireland, they would have made their way into Ireland, or even the UK where they would have been more than free to practice their religion and preserve their culture. I've no doubt that many of them had family ties to the North that dated far back, and that it would have been a hardship for them to leave, but they would not have lost a nation or have been cast into a region where they were not welcome.
Palestinians driven from Israel have Palestine, as the Catholics had Ireland. For the Jews there is only Israel.
This is not to minimize the impact of being forced from one's home, but to emphasize the stakes for Israelis.
The goal of Catholics was not to overrun Northern Ireland and effectively render it a Cathlolic region, but this is the goal of the Palestinians as respects The Right of Return.
You seem to think there is not much that Israelis have to lose if they accept a position as a minority within a Greater Palestine, but when has a Jewish minority ever felt completely secure, and more times than not, they have been a target. Why should they ever trust Palestinan Muslims to honor and protect their rights?