suggest it is because they want to stay in their homes in Gaza or go back to their homes in Israel - they are refugees remember.
However, Israel won't let them go back and continues to have a racist/religiously biased (depending on whether you consider Jews to be a race) immigration policy. If you are a Jew, you have a right to enter and become a citizen, if you are not a Jew forget it.
Australia long ago abandoned its White Australia policy as it should have. About time Israel followed suit.