The Mandate called for a home for Jews in Palestine...they would have been issued Palestinian Passports. There was no mention of removing all Arabs from Palestine at all. Jews were allowed to live there with the proviso they did not interfere with the rights or freedoms of the indigenous already living there. Israel has never managed its immigration. It has never put a cap on it. If you want to overcrowd your state that is your problem. The Palestinians should not have to pay for your mismanagement or lapse in a realistic view. Nor is it a reason for Palestinians to give any of their land to you.
Firebomb thrown during demonstration in northern Israeli town of Umm al Fahm (Haaretz)