Mark, you're kind of wrong. There were already refugees by the time of the Arab invasion in '48, because the Yishuv and the Palestinians had been fighting for nearly six months since the partition plan came out. And before you say well the Arabs should have accepted partition, recognize the fact that even in the partition plan's Israel there were too many Palestinian Arabs, and that many of them would have had to leave their homes -- very few Jews, if any, would have had to leave the new Arab state.
Palestinian girl, 17, arrested in Old City of Jerusalem with knife in her bag (Haaretz)
from the article: Hamas leader: You can't get rid of us