For over 20 years now the explanation of why so many Palestinians left their home was re-examined in the light of historical evidence, not propaganda. You are still somewhere in the fog of the past. The majority left temporarily because of the war situation. For comparison: During the 2006 war in Lebanon, a million Israelis of the North came down south to escape the rockets. The road to knowledge: First you read about fact, then you think about them, then you type and post.
Egypt to hold parliamentary election in 2 phases starting Oct 18-19 (Reuters)
from the article: Carter: Sheikh Jarrah evictions are against international law