To debunk the myth that Israel is a nation with fair treatment to all, its time to note that most anti-Palestinians laws have been on the books from 1954 and before.
Basically the right to return question somewhat is rooted in the question of did Palestinian that suddenly found themselves within the borders of the new State of Israel leave voluntarily or of their own free will? And even if its an own free will question, its totally rational for all civilians to leave ground zero when they find themselves right in the middle of two or more fighting armies.
But Israel has taken the position that ANY Palestinian left the 1948 borders forfeited all property and right to return to Israel rights. And now we find out its was a pre-1948 Israeli written policy to drive all Palestinians out at the Zionist point of the gun. Except for the many Palestinians who were murdered instead.
http://www.ifamericansknew.org/history/ref-qumsiyeh.html
The fact that Israel treated its remaining Arab Nationals almost equally still misses the point. Israel is only an apartheid State democracy because it disenfranchises and imprisons 30% of its population.