Could you get along if your neighbor took your home? Same question
After World War II, it was apparent the Jews needed a safe place to live. It was decided Palestine would be their home. When they decided to start the country of Israel, Muslims in the area decided to start a war against Israel. Some Palestinians in Israel decided to leave Israel until the war was over. After the war was over, Israel did not let them return to their homes because they feared the Palestinians would try to cause them trouble, or that is my understanding.