Plenty of Palestinians have moved to the surrounding Arab countries (those who Israel didn't blockade in, at least), but many wish to stay out of principal. Much of the land you call "Israel" was apportioned to the Palestinians. It's theirs, by international law. And Israel are breaking the codes of the Geneva Convention by occupying parts of it.
But for a wider narrative, Israel planted itself in the middle of several Arab, Semitic, mostly Muslim states, effectively displacing millions of people after the second world war. It was the British who engineered that. Technically, the Palestinians just want back what they consider to be rightfully theirs. Of course it depends how you define ownership. Then I suppose that's what this thread is really about, anyway: you have the idea that Israel is "right", (regardless of its abuses), because Israel is featured in the bible as God's chosen people. Even though, ironically, barely any of them profess Jesus to have died and risen from death.
It's funny, there's a helluva lot of irony in the whole scenario. I mean, another instance of it, is how the Ashkenazis were given land from the British Mandate (land that wasn't the British's land to give), in order to escape genocide and eugenics and horrifically discriminative treatment in Germany, only to displace millions of innocent Palestinians (many of whom had fought for the Allies in the war), to then begin an expanstionistic, imperialistic, heavily discriminatory campaign (some might say prolonged genocide) against the Palestinians, who, of course, got absolutely no help from the British, French, or indeed Americans who had so callously betrayed their services.
But, whatever, you know. Let's disregard all that, because thousands of years ago, a small stretch of land in the middle of Modern Israel was home to the ancient Judaistic religion and its adherents. Nevermind that most of Israel wasn't (and still isn't) Jewish, because you had the Ephraim, the Samaritans, Samarians, those who followed Egyptian religions, then in Jesus' time you had all these plus Buddhists, Confucians, and Zoroastrians. But still. It belongs to the Jews, right? (Most ethnic Jews are actually atheists, nowadays, just so you know).
And by that logic, I am brought full circle, Sirk, right back to you. If that land still belongs to the Jews because it belonged to the collective Israelis (of many religions) two thousand years ago, then you better pack up and get back to England, because you're no Native American! :'D