Too bad, so sad.
There is no such thing as Palestine.
Yes, there is. And the Arab and Christians there were promised self-determination. Palestine was there before the British created Israel after WWI in the hope they could get rid of all Europe's Jews by sending them to Palestine.
Well, they used to live together there a couple of thousand years ago. Jews and Arabs. But then this funny thing called Islam came along and the Arabs decided they needed to separate themselves from the infidels. So as they did in India, they wanted a country of their own. Problem is Jews were living in that land.
So we have a situation where these Muslims decided about a thousand years ago that nobody but Muslims were good enough to live around them. These Muslims feel that the best way to deal with the problem is ether expel Christians and Jews or just outright murder them.
They can't get along with anyone. Israel got tired of the assholes blowing up their people, so they started using checkpoints and expulsions to protect themselves from attack.